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中小学教育资源及组卷应用平台
8B Unit5 重点语法提升练
单元语法：enough to 和too…to
1."…形容词或副词+enough（for sb.）to do sth."结构的意思是"（对某人来说）足够..以至于能做某事"。
例如∶ The boy is old enough to go to school.
The hall is big enough to hold 100 persons.
扩展∶ enough to 结构和so...that结构可以转换。
"enough to"结构引导的句子是简单句，而"so …that"引导的句子是复合句。
例如∶ The young man is strong enough to carry that heavy box.
=The young man is so strong that he can carry that heavy box.
2.too…to结构的意思是"太…….而至于不能…."，表达一个否定的结果。其中too的后面加形容词或副词。
例如∶My little brother is too young to look after himself.
too.…to 句型可以跟so …that句型互换，
所以上述的句子还可以改成∶My little brother is so young that he can't look after himself.
扩展∶当"enough to"结构与"too...to"结构转换时，形容词或副词要作出相应的变化，即∶enough前的形容词或副词与too后的形容词或副词为反义词，同时应该改为"not …enough to"的形式。
例如∶too slow to = not fast enough to
too bad to = not good enough to
3.在"too...to"和"enough to"结构中，如果动词不定式和主语构成动宾关系，则动词不定式所在动词后不能重复用代词。
例如∶ The problem is too hard for the girl to work out.（正确）
The problem is too hard for the girl to work it out.（错误）
语法过关小测
满分：60分；时间：40分钟
一、单项选择（每小题1分，共40分）
1．Luckily, more and more people in China are ________ to keep their voice down in public.
A．too polite B．too impolite C．enough polite D．polite enough
2．The customer thought the potato chips were not ________, so George cut them much thinner to make the customer happy.
A．thin enough B．enough thin C．too thick D．thick too
3．There are so many people on the bus. We don’t have ________ stand in.
A．enough space for B．space enough for
C．many space for D．enough space to
4．—Can you tell us when the disease can be prevented completely
—I’m afraid it is still ________ to talk about that. We’ll see.
A．so late B．so early C．too late D．too early
5．The meeting room isn’t ________ for all of us. We need a bigger one ________.
A．enough large; stay in B．large enough; to stay in
C．large enough; to stay in it D．enough large; stay in it
6．This book is _______ hard ________ me _______understand.
A．too, of, to B．too, for, too C．to, with, too D．too, for, to
7．He doesn’t do his homework ________, so he always makes some mistakes.
A．careful enough B．enough carefully C．carefully enough D．enough careful
8．—I am 65 years old.
—You are _________ take the driver’s license test.
A．not young to B．too old to C．too young to D．not old enough to
9．—Mum, I’m offered 8,000 yuan a month for the part-time job.
—Really It just sounds ________ to be true.
A．so well B．too good C．good enough D．too well
10．—Samuel, I successfully got my driving license (驾照) yesterday.
—Congratulations! But as a new driver, you can’t drive ________ carefully.
A．so B．very C．too D．more
11．Our class basketball team won the game. I was ________ excited to sleep.
A．quite B．too C．very
12．The little girl was too frightened _______ a word.
A．not to tell B．not to say C．to tell D．to say
13．Mike did not write ________, though he had ________.
A．careful enough; time enough B．carefully enough; enough time
C．enough careful; enough time D．enough carefully; time enough
14．The wedding is so important that it’s never ________ for the young couple to prepare for it.
A．too late B．late enough C．too early D．early enough
15．The teacher spoke ________ quickly for me to understand.
A．very B．too C．so
16．He runs too fast _______.
A．to following B．for us to follow C．for us not to follow D．following
17．The little boy is ________ young ________ go to school now.
A．too; to B．to; to C．so; that D．such; that
18．The fog was ________ for us to exercise outside this morning.
A．too heavy B．so heavy C．very heavy D．quite heavy
19．—Our English teacher always tells us to circle the key words when doing reading exercises.
—It’s a useful skill. So it can’t be repeated ________ often.
A．so B．too C．very D．quite
20．Can’t believe you are so lucky! The news is just ______ to be true.
A．very good B．so good C．too good D．quite good
21．Mr. Copper is ________ tired ________ do anything this morning.
A．so; that B．too; to C．both; and D．enough; to
22．This exercise is _________ hard _________.
A．too; for any one of us to do it B．too; for any one of us to do
C．so; that many of us can do it D．so; that few of us can do
23．It’s said that the water in the lake will be ________ for us ________.
A．too clean; to drink B．enough clean; to drink
C．so clean; to drink D．clean enough; to drink
24．Just be yourself, because life is _________ to be anybody else.
A．too long B．long enough C．too short D．short enough
25．I’m worried about the competition. I’m left with ________ little time to prepare fully.
A．too B．very C．so D．such
26．The bag is ________ heavy for me to carry.
A．very B．too C．so D．quite
27．—Your grandparents like travelling, right
—Yes. They think one is never ________ enjoy life.
A．too young to B．too old to C．young enough to D．old enough to
28．The little girl is ________ young ________ go to school.
A．too; to B．so; that C．such; that D．enough; to
29．—Why did little Jack open his birthday present early
—Because he was ________ to wait until that day. He just bad to see what was inside.
A．too curious B．curious enough C．too impatient D．impatient enough
30．This passage is not ________ for you ________ understand.
A．easy enough; for B．enough easy; for
C．easy enough; to D．enough easy; to
31．It’s said that the water in the river will be ________ for us ________.
A．too clean; to drink B．enough clean; to drink
C．so clean; to drink D．clean enough; to drink
32．The book is _________ for us children _________ and it’s also fun.
A．hard enough; reading B．enough hard; read
C．easy enough; to read D．enough easy; to read
33．—How great your New Year’s resolutions are!
—But sometimes I think they are ________ difficult ________ keep.
A．very; to B．so; that C．too; to D．enough; to
34．—During this hard time, it is ________ to have lots of food to eat.
—Yeah, I agree. We really shouldn’t complain too much.
A．good enough B．bad enough C．too good D．too bad
35．We don’t have________ to buy this sweater, although the sweater is ________ for me.
A．enough money; good enough B．money enough; enough good
C．money enough; well enough D．enough money; enough well
36．My little sister isn’t ________ to go to school.
A．enough old B．young enough C．too old D．old enough
37．It isn’t ________ to solve the math problem. Few of us could even understand it.
A．easy enough B．enough easy C．difficult enough D．enough difficult
38．Although Mike ran ________, he still missed the early bus because it left a minute earlier.
A．enough fast B．fast enough C．enough quickly D．quick enough
39．As a Grade 9 student, you can never be ________ careful while studying in class.
A．so B．very C．too D．more
40．—It’s dangerous to walk across the street carelessly.
—You’re right. We can’t be ________ careful when crossing the street.
A．so B．very C．too D．much
二、完成句子（每小题2分，共20分）
41．The math homework was so difficult that I couldn’t work it out.（改为同义句）
The math homework was difficult for me work out.
42．The little boy is so short that he can’t reach the box. (写出同义句)
The little boy is short reach the box.
43．The little boy is too young to go to school. （改为同义句）
The little boy isn’t to go to school.
44．I was too stupid to understand you then. (改为同义句)
I was not understand you then.
45．Jodie is so independent. She makes decisions on her own. (合并为一句)
Jodie is independent make decisions on her own.
46．The Maths problem is too difficult for me to work out.
The Maths problem isn’t for me work out.
47．The girl is so young that she can’t go to school.（改为同义句）
The girl is to school.
48． My cousin Bill is not old enough to join the army.（同义句转换）
My cousin Bill is young join the army.
49．Jackie is kind enough to help me.（改为复合句）
Jackie is he can help me.
50．He is only four. He can’t go to school now. （改为同义句）
=He is young to school now.
=He is old to school now.
=He is young he can’t go to school now.
答案与解析
一、单项选择（每小题1分，共40分）
1．Luckily, more and more people in China are ________ to keep their voice down in public.
A．too polite B．too impolite C．enough polite D．polite enough
【答案】D
【详解】句意：幸运的是，越来越多的中国人有礼貌地在公共场合小声说话。
考查形容词用法；polite adj.有礼貌的；impolite adj.不礼貌的。too…to…“太……以至于不能……”；adj.+enough to do sth“足够……去做某事”，根据“keep their voice down in public. ”可知是礼貌的行为，故选D。
2．The customer thought the potato chips were not ________, so George cut them much thinner to make the customer happy.
A．thin enough B．enough thin C．too thick D．thick too
【答案】A
【详解】句意：顾客认为薯片不够薄，所以乔治把它们切得更薄来让顾客满意。
考查enough的用法。thin enough足够薄；enough thin错误表达；too thick太厚；thick too错误表达。 根据“so George cut them much thinner”可知，顾客之前觉得薯片“不够薄”，enough修饰形容词时要后置，“thin enough”的否定形式“not thin enough”意为“不够薄”，符合语义。故选A。
3．There are so many people on the bus. We don’t have ________ stand in.
A．enough space for B．space enough for
C．many space for D．enough space to
【答案】D
【详解】句意：公共汽车上有这么多人。我们没有足够的空间站进去。
考查enough的用法。根据“There are so many people on the bus.”结合语境可知，此处应指没有足够的空间站进去，enough+名词+to do“有足够的……去做某事”，enough修饰名词可前可后。故选D。
4．—Can you tell us when the disease can be prevented completely
—I’m afraid it is still ________ to talk about that. We’ll see.
A．so late B．so early C．too late D．too early
【答案】D
【详解】句意：——你能告诉我这个疾病什么时候能被完全制止吗？——恐怕现在讲这个还太早。我们再观望一下吧。
考查的是too...to...的用法。根据后文“We’ll see.”可知前文的意思是目前还太早而无法下结论，应该是否定回答。too...to...表示“太……而不能……”符合题意，而early表示“早的”。故选D。
5．The meeting room isn’t ________ for all of us. We need a bigger one ________.
A．enough large; stay in B．large enough; to stay in
C．large enough; to stay in it D．enough large; stay in it
【答案】B
【详解】句意：会议室对我们所有人来说不够大。我们需要一个更大的来待在里面。
考查enough的用法和不定式表示目的。enough修饰形容词时，应置于形容词后，即“large enough”（足够大）。第二空“to stay in”是不定式作后置定语修饰“a bigger one”，此处“one”指代前面的“meeting room”，不定式中的“in”已经与“one”构成逻辑上的动宾关系，不需要再加“it”，因此排除C选项。故选B。
6．This book is _______ hard ________ me _______understand.
A．too, of, to B．too, for, too C．to, with, too D．too, for, to
【答案】D
【详解】句意：这本书对我来说太难理解了。
考查固定句型。too+形容词+for sb.+to do sth.意为“对某人来说太……而不能做某事”，这里表示太难而无法理解。故选D。
7．He doesn’t do his homework ________, so he always makes some mistakes.
A．careful enough B．enough carefully C．carefully enough D．enough careful
【答案】C
【详解】句意：他做作业不够认真，所以他总是犯一些错误。
考查enough的用法以及副词辨析。careful认真的，形容词；carefully认真地，副词。enough修饰形容词或副词时，要放在形容词或副词之后，排除B和D；此处修饰动词“do”，应该使用副词carefully。故选C。
8．—I am 65 years old.
—You are _________ take the driver’s license test.
A．not young to B．too old to C．too young to D．not old enough to
【答案】B
【详解】句意：——我65岁了。——你年纪太大了，不能考驾照了。
考查形容词短语。not young to表述错误；too old to太老了而不能；too young to太年轻而不能；not old enough to不够老，不能。根据固定句型too...to...，意为“太……而不能……”，结合前句“65岁”的语境，可知此处指年纪太大无法考驾照。故选B。
9．—Mum, I’m offered 8,000 yuan a month for the part-time job.
—Really It just sounds ________ to be true.
A．so well B．too good C．good enough D．too well
【答案】B
【详解】句意：——妈妈，这份兼职工作每月给我8000元报酬。——真的吗？这听起来好得令人难以置信。
考查形容词辨析。sound是系动词，后面需要接形容词作表语，well作为形容词时通常表示“身体健康的”，不符合语境，排除A、D；“too+形容词/副词+to do sth.”是一个固定结构，意思是“太……而不能……”；“形容词/副词+enough+to do sth.”意思是“足够……去做某事”；本句表达“这份工作报酬听起来好得让人觉得不真实”，用“too good to be true”符合语境。故选B。
10．—Samuel, I successfully got my driving license (驾照) yesterday.
—Congratulations! But as a new driver, you can’t drive ________ carefully.
A．so B．very C．too D．more
【答案】C
【详解】句意：——Samuel，我昨天成功拿到了驾照。——恭喜！但作为新司机，你再怎么小心也不为过。
考查副词辨析。so如此；very非常；too太；more更多。根据对话中“as a new driver”的提示，说明作为新手司机应该格外小心，can’t + 动词原形 + too + 形容词 / 副词表示“再……也不为过”的含义。故选C。
11．Our class basketball team won the game. I was ________ excited to sleep.
A．quite B．too C．very
【答案】B
【详解】句意：我们班的篮球队赢了比赛，我兴奋得睡不着觉。
考查副词辨析。quite相当；too太；very非常。根据“I was…excited to sleep”可知，此处是“too+形容词+to do sth”结构，表示“太……而不能做某事”，too符合语境。故选B。
12．The little girl was too frightened _______ a word.
A．not to tell B．not to say C．to tell D．to say
【答案】D
【详解】句意：这个小女孩太害怕了以至于不能说一句话。
考查非谓语以及动词辨析。too...to...太……以至于不能……，本身表示否定，排除A和B；tell讲述，say说（后接说话的内容），根据句意可知，表示“说一句话”，故选D。
13．Mike did not write ________, though he had ________.
A．careful enough; time enough B．carefully enough; enough time
C．enough careful; enough time D．enough carefully; time enough
【答案】B
【详解】句意：Mike写得不够仔细，尽管他有足够的时间。
考查enough的用法。enough修饰形容词或副词时需后置；修饰名词时放前放后均可。第一空修饰动词write，应用副词carefully，carefully enough意为“足够仔细”；第二空enough time/time enough均可，意为“足够的时间”，故选B。
14．The wedding is so important that it’s never ________ for the young couple to prepare for it.
A．too late B．late enough C．too early D．early enough
【答案】C
【详解】句意：婚礼是如此重要，年轻的夫妇准备它永远不会嫌早。
考查短语辨析。too late to太迟而不能；late enough to足够迟去做某事；too early to太早而不能；early enough to足够早去做某事。根据“The wedding is so important”可知婚礼很重要，所以要早准备，根据“never”可知是否定，所以此处用双重否定表肯定，可推测出此处是“too early”。故选C。
15．The teacher spoke ________ quickly for me to understand.
A．very B．too C．so
【答案】B
【详解】句意：这个老师说得太快了，我听不懂。
考查副词的用法。分析句子“The teacher spoke…quickly for me to understand.”可知，“too + 形容词 / 副词 + for sb. to do sth.”，意为 “太…… 以至于某人不能做某事”，此处应填入too，修饰副词quickly，表达老师说得太快了，以至于我听不懂。故选B。
16．He runs too fast _______.
A．to following B．for us to follow C．for us not to follow D．following
【答案】B
【详解】句意：他跑得太快，我们跟不上。
考查too...to结构。too...to意为“太……以至于不能……”，根据句意可知应该是“太快以至于跟不上”，排除C选项，too...to结构中的to是不定式，后面加动词原形，排除A选项，D选项形式不对，B选项意思和结构都符合，故选B。
17．The little boy is ________ young ________ go to school now.
A．too; to B．to; to C．so; that D．such; that
【答案】A
【详解】句意：这个小男孩现在还太小，不能上学。
考查固定用法。too...to...太……而不能……，后接动词或动词短语；so...that...如此……以致……，后接从句；such...that...如此……以致……，后接从句。“go to school ”是动词短语，故用too...to连接。故选A。
18．The fog was ________ for us to exercise outside this morning.
A．too heavy B．so heavy C．very heavy D．quite heavy
【答案】A
【详解】句意：今天早上雾太大，我们不能在外面锻炼。
考查固定短语。too…to…太……而不能……，表结果，后接短语；so…that引导结果状语从句。根据“The fog was…for us to exercise”可知，本句用不定式表结果，需用too…to结构，故选A。
19．—Our English teacher always tells us to circle the key words when doing reading exercises.
—It’s a useful skill. So it can’t be repeated ________ often.
A．so B．too C．very D．quite
【答案】B
【详解】句意：——我们的英语老师总是告诉我们在做阅读练习时圈出关键词。——这是一项有用的技巧。所以再怎么频繁重复都不为过。
考查副词辨析。so如此；too太；very非常；quite相当。根据“So it can’t be repeated...often.”可知，“can’t...too...”是一个固定表达，意思是“再……也不为过”，在本句中表示这个技巧再怎么频繁重复强调都不过分，符合语境。故选B。
20．Can’t believe you are so lucky! The news is just ______ to be true.
A．very good B．so good C．too good D．quite good
【答案】C
【详解】句意：真不敢相信你这么幸运！这消息好得令人难以置信。
考查固定搭配。very good非常好；so good如此好；too good太好；quite good相当好。根据“The news is just ...to be true.”可知，本题考查用too ... to do sth.表示“太……而不能……”，指消息好得令人难以置信。故选C。
21．Mr. Copper is ________ tired ________ do anything this morning.
A．so; that B．too; to C．both; and D．enough; to
【答案】B
【详解】句意：Mr. Copper今天早上太累了，什么也做不了。
考查固定搭配。so ... that ... 如此……以至于……；too ... to ... 太……而不能……；both ... and ... ……和……都；enough ... to do sth.足够……能做某事。根据“... tired ... do anything this morning”可知是太累了而不能做任何事情。故选B。
22．This exercise is _________ hard _________.
A．too; for any one of us to do it B．too; for any one of us to do
C．so; that many of us can do it D．so; that few of us can do
【答案】B
【详解】句意：这个练习对我们任何人来说都太难了不能做。
考查固定句型。Sth. +be +too+adj.+for sb.+to do 某事对某人来说太……而不能……，固定句型，本句型的主语，逻辑上是动词不定式的宾语，所以do后面不能用代词，排除A，B是正确的。so+形容词+that+从句：如此……以至于……，这个句型是结果状语从句，是复合句，从句中“it”指代前句中“This exercise”，不能省略，所以D错误；选项C“这个练习太难了，我们很多人都能做。”不符合逻辑关系，错误。故选B。
23．It’s said that the water in the lake will be ________ for us ________.
A．too clean; to drink B．enough clean; to drink
C．so clean; to drink D．clean enough; to drink
【答案】D
【详解】句意：据说湖里的水足够干净，我们可以喝。
考查固定结构。too…to…太……而不能，不定式表否定意义；enough…to…足够……能做某事；so…to…表达错误；enough修饰形容词需后置，可排除B项；结合语境可知，句子表达的是“水足够干净可以喝”，too…to…不合语境，故选D。
24．Just be yourself, because life is _________ to be anybody else.
A．too long B．long enough C．too short D．short enough
【答案】C
【详解】句意：做你自己就好，因为人生很短，根本没时间模仿别人。
考查词汇辨析。too long太长；long enough足够长；too short太短；short enough足够短。too...to...表示“太……而不能……”，固定搭配，故排除B、D；根据“Just be yourself, because life is ... to be anybody else”可知，人生太短，所以要做好自己。故选C。
25．I’m worried about the competition. I’m left with ________ little time to prepare fully.
A．too B．very C．so D．such
【答案】A
【详解】句意：我担心比赛。我剩下的时间太少了而不能充分准备。
考查too…to。too太；very很；so如此；such如此；根据“…to prepare fully”可知，是“too…to”表示为“太……而不能”，故选A。
26．The bag is ________ heavy for me to carry.
A．very B．too C．so D．quite
【答案】B
【详解】句意：这个包对我来说太重了，我拿不动。
考查副词及固定句型辨析。very非常；too太；so如此；quite相当。根据“The bag is ... heavy for me to carry.”可知，此处考查固定句型“too + 形容词 + for sb. to do sth.”，表示“对某人来说太……而不能做某事”。故选B。
27．—Your grandparents like travelling, right
—Yes. They think one is never ________ enjoy life.
A．too young to B．too old to C．young enough to D．old enough to
【答案】B
【详解】句意：——你的祖父母喜欢旅行，对吗？——是的。他们认为一个人从不会因年纪太大而不能享受生活。
考查固定搭配用法。too young to太年轻而不能；too old to太老而不能；young enough to足够年轻去；old enough to足够老去；此处是too…to…“太……而不能……”的结构，根据答语Yes和enjoy life可知，此处说的是“不会因年纪太大而不能享受生活”，故选B。
28．The little girl is ________ young ________ go to school.
A．too; to B．so; that C．such; that D．enough; to
【答案】A
【详解】句意：这个小女孩太小，不能上学。
考查副词短语。too...to太……而不能；so...that如此……以至于，后面加句子；such...that如此……以至于，后面加句子；enough...to足够……可以。根据“The little girl is...young...go to school.”可知，是小女孩太小不能上学，后面是动词原形go，用too...to结构。故选A。
29．—Why did little Jack open his birthday present early
—Because he was ________ to wait until that day. He just bad to see what was inside.
A．too curious B．curious enough C．too impatient D．impatient enough
【答案】A
【详解】句意：——小杰克为什么早早地就打开了他的生日礼物？——因为他太好奇了，等不到那一天。他只是迫不及待地想看看里面是什么。
考查形容词辨析和短语辨析。too...to...太……而不能……；enough...to...足够……而能……。curious好奇的；impatient不耐烦的。根据“He just had to see what was inside.”可知，此处说的是他太好奇了，等不到那一天，too curious to wait表示“太好奇而等不了”，符合题意，故选A。
30．This passage is not ________ for you ________ understand.
A．easy enough; for B．enough easy; for C．easy enough; to D．enough easy; to
【答案】C
【详解】句意：这篇文章对你来说不够容易理解。
考查enough用法和动词不定式作结果状语。easy容易的，形容词；enough足够地，副词，修饰形容词时置于形容词之后，排除B和D。分析句子结构可知，此处考查not adj. enough to do sth.“不足够……做某事”，所以第二空处应用动词不定式to understand作结果状语，排除A。故选C。
31．It’s said that the water in the river will be ________ for us ________.
A．too clean; to drink B．enough clean; to drink
C．so clean; to drink D．clean enough; to drink
【答案】D
【详解】句意：据说河里的水将足够干净，我们可以喝。
考查固定结构。too...to...太……而不能；enough...to...足够……能做某事；so...to...表达错误。enough修饰形容词需要后置，根据语境可知，此处表达的是“河里的水足够干净可以喝”，too...to...不符合语境。故选D。
32．The book is _________ for us children _________ and it’s also fun.
A．hard enough; reading B．enough hard; read C．easy enough; to read D．enough easy; to read
【答案】C
【详解】句意：这本书对我们孩子来说足够简单去阅读，而且也很有趣。
考查enough和非谓语动词用法。hard enough足够难；easy enough足够简单。“enough”修饰形容词时，需放在形容词后，排除B和D；根据“and it’s also fun”可知，书适合孩子读，第一空用“easy enough”，后接不定式“to read”。故选C。
33．—How great your New Year’s resolutions are!
—But sometimes I think they are ________ difficult ________ keep.
A．very; to B．so; that C．too; to D．enough; to
【答案】C
【详解】句意：——你的新年决心多么伟大啊！——但有时我觉得它们太难了而不能坚持。
考查短语辨析。very…to…非常……以至于……；so...that...如此 以至于……，that后接从句；too...to...太……而不能……，to后给你动词原形；enough...to...足够……以至于能。根据“they are...difficult...keep”可知，此处说的是“太难了而不能坚持”，应用too...to...的结构，故选C。
34．—During this hard time, it is ________ to have lots of food to eat.
—Yeah, I agree. We really shouldn’t complain too much.
A．good enough B．bad enough C．too good D．too bad
【答案】A
【详解】句意：——在这么艰难的时期，能有足够的食物已经非常好了。——是的，我认同。我们不应该抱怨太多。
考查形容词辨析和enough用法。good好的；bad坏的；too ... to ...太……以至于不能……；enough...to...足够……。根据“to have lots of food to eat”可知，有足够的食物很好，形容词置于enough之前，故选A。
35．We don’t have________ to buy this sweater, although the sweater is ________ for me.
A．enough money; good enough B．money enough; enough good
C．money enough; well enough D．enough money; enough well
【答案】A
【详解】句意：我们没有足够的钱买这件毛衣，尽管这件毛衣对我来说足够好。
考查enough的用法。enough作形容词修饰名词时，通常放在名词前，即“enough money”；作副词修饰形容词或副词时，放在被修饰词之后，即“good enough”。选项A符合这两个规则。故选A。
36．My little sister isn’t ________ to go to school.
A．enough old B．young enough C．too old D．old enough
【答案】D
【详解】句意：我妹妹还没到上学的年龄。
考查enough的用法和形容词辨析。enough old表述错误，enough修饰形容词时应置于其后，故排除选项A；young enough足够年轻；too old太老；old enough足够大。根据“My little sister isn’t...to go to school.”可知，此处指的是妹妹还没到上学的年龄，应用old enough，表示“足够大”。故选D。
37．It isn’t ________ to solve the math problem. Few of us could even understand it.
A．easy enough B．enough easy C．difficult enough D．enough difficult
【答案】A
【详解】句意：这道数学题解起来并不足够容易。我们中甚至没几个人能理解它。
考查enough的用法。easy enough足够容易；enough easy结构错误；difficult enough足够难；enough difficult结构错误。当enough修饰形容词或副词时，enough需要后置。根据“Few of us could even understand it.”可知，这道数学题解起来并不足够容易。故选A。
38．Although Mike ran ________, he still missed the early bus because it left a minute earlier.
A．enough fast B．fast enough C．enough quickly D．quick enough
【答案】B
【详解】句意：虽然Mike跑得足够快，但他还是错过了早班车，因为它早走了一分钟。
考查副词辨析和enough的用法。enough fast错误表达；fast enough足够快；enough quickly错误表达；quick enough足够快。enough修饰形容词或副词时，必须后置，所以排除选项A和C；run fast“跑得快”。故选B。
39．As a Grade 9 student, you can never be ________ careful while studying in class.
A．so B．very C．too D．more
【答案】C
【详解】句意：作为一名九年级学生，在课堂上学习时你再怎么小心也不为过。
考查副词辨析。so如此；very非常；too太；more更多。“can never be too+形容词”是固定搭配，表示“再……也不为过”。因此空格处应填入too。故选C。
40．—It’s dangerous to walk across the street carelessly.
—You’re right. We can’t be ________ careful when crossing the street.
A．so B．very C．too D．much
【答案】C
【详解】句意：——粗心过马路是很危险的。——你说得对。过马路时我们再小心也不为过。
考查副词辨析。so如此；very非常；too太；much非常，很。根据“It’s dangerous to walk across the street carelessly.”可知，过马路粗心很危险，所以过马路时要非常小心，再小心也不为过，“can’t be too+形容词”表示“再……也不为过”，所以此处应用too。故选C。
二、完成句子（每小题2分，共20分）
41．The math homework was so difficult that I couldn’t work it out.（改为同义句）
The math homework was difficult for me work out.
【答案】 too to
【详解】句意：数学作业太难了以致于我做不出来。so...that...如此……以至于……；根据题目要求以及“The math homework was...difficult for me...work out.”，可知too...to...太……以至于不能……；too后面加形容词或者副词，to后面加动词原形，符合题意。故填too；to。
42．The little boy is so short that he can’t reach the box. (写出同义句)
The little boy is short reach the box.
【答案】 too to
【详解】句意：这个小男孩太矮了，够不着那个箱子。“so+形容词/副词+that从句”意为“如此……以至于……”，句中that从句是否定式，从句里的主语“he”指代主句里的主语“The little boy ”，可以转换为too…to do sth.结构，too后跟形容词或副词，意为“太……而不能……”，故填too；to。
43．The little boy is too young to go to school. （改为同义句）
The little boy isn’t to go to school.
【答案】 old enough
【详解】句意：这个小男孩太小，不能上学。原句中使用了too…to…结构，意为“太……以至于不能……”；同义句中谓语动词部分使用了isn’t否定形式，故可用…enough to…结构替换，意为“足够……去做某事”。替换时形容词要改为反义词，old指年龄大的。故填old；enough。
44．I was too stupid to understand you then. (改为同义句)
I was not understand you then.
【答案】 clever enough to
【详解】句意：我当时太笨了，不懂你的意思。原题干含有“too+形容词+to do sth.”结构，意为“太……而不能……”，其同义句型为“not+形容词+enough to do sth.”，意为“不够……而不能……”，两个句型中的形容词意义相反，stupid的反义词为clever。故填clever；enough；to。
45．Jodie is so independent. She makes decisions on her own. (合并为一句)
Jodie is independent make decisions on her own.
【答案】 enough to
【详解】句意：朱迪很独立。她自己做决定。根据原句可知，此处指Jodie足够独立，能独自做决定，be adj. enough to do sth“足够……做某事”。故填enough；to。
46．The Maths problem is too difficult for me to work out.
The Maths problem isn’t for me work out.
【答案】 easy enough to
【详解】句意：这道数学题对我来说太难了。too ... to do sth.“太……而不能做某事”，改写后的句子空前有否定词isn’t，形容词用difficult的反义词easy表示“容易的”，此处表示不够容易，enough后置，修饰形容词，其后用动词不定式。故填easy；enough；to。
47．The girl is so young that she can’t go to school.（改为同义句）
The girl is to school.
【答案】 not old enough to go
【详解】句意：这个女孩太小了，不能上学。本句是“so ... that ...”句式，当that引导的从句为否定句时，可以与be not ... enough to do转换；young转换为not old；故填not；old；enough；to；go。
48． My cousin Bill is not old enough to join the army.（同义句转换）
My cousin Bill is young join the army.
【答案】 too to
【详解】句意：我表弟比尔还没有到参军的年龄。not adj. enough to do sth不够……而不能做某事，可以和too+adj.+to do sth“太……而不能做某事”进行转换，故填too；to。
49．Jackie is kind enough to help me.（改为复合句）
Jackie is he can help me.
【答案】 so kind that
【详解】句意：杰基很好心地帮助我。本题的be+形容词+enough to do“足以做某事”，可以用so...that“如此……以至于”替换，enough前的形容词是kind，故填so；kind；that。
50．He is only four. He can’t go to school now. （改为同义句）
=He is young to school now.
=He is old to school now.
=He is young he can’t go to school now.
【答案】 too to go not enough to go so that
【详解】句意：他只有四岁。他现在不能去上学。too…to…“太……以至于不能……”，可知应该是太小了，以至于不能去上学，即He is too young to go to school now；adj.+ enough to do sth“足够……去做某事”，可知应该是不够大，不能去学校，变成否定句时在be动词后加not，即He is not old enough to go to school now；so …that…“太……以至于……”，可知应该是太小了，以至于不能去学校，即He is so young that he can’t go to school now。故填too；to；go；not；enough；to；go；so；that。
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