【弯道超车】Unit 7 To Spend or to Save 核心语法之状语从句-2026-2027学年鲁教版(五四学制)(新教材)八年级英语上册精讲精练 (含答案解析)

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【弯道超车】Unit 7 To Spend or to Save 核心语法之状语从句-2026-2027学年鲁教版(五四学制)(新教材)八年级英语上册精讲精练 (含答案解析)

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2026-2027学年鲁教版(五四学制)八年级英语上册核心语法精讲精练
(新教材)Unit 7 To Spend or to Save
核心语法:状语从句
一、核心概念
状语从句在复合句中充当状语成分,用来修饰主句的动词、形容词或整个句子,表示时间、地点、原因、条件、目的、结果、让步等关系。
核心功能: 用一个句子来说明主句动作发生的“时间”、“原因”、“条件”等。
核心规则: 状语从句中,如果主句是将来时,从句用一般现在时表示将来(“主将从现”)。
二、状语从句的分类与引导词
以下六类状语从句:
1. 时间状语从句
引导词 含义 例句
when 当……时候 When I arrived, he was leaving.
while 在……期间 While I was reading, he came in.
as soon as 一……就 I will call you as soon as I arrive.
before 在……之前 Turn off the lights before you leave.
after 在……之后 After I finished, I went out.
until 直到…… I waited until he came back.
2. 条件状语从句
引导词 含义 例句
if 如果 If it rains, we will stay at home.
unless 除非,如果不 You will fail unless you study hard.
3. 原因状语从句
引导词 含义 例句
because 因为 I stayed home because it was raining.
since 既然 Since you are here, let's start.
as 由于 As it was dark, we went home.
4. 目的状语从句
引导词 含义 例句
so that 以便 I got up early so that I could catch the bus.
5. 结果状语从句
引导词 含义 例句
so...that 如此……以至于 The box is so heavy that I can't carry it.
such...that 如此……以至于 It was such a hot day that we went swimming.
6. 让步状语从句
引导词 含义 例句
although / though 虽然 Although it rained, we went out.
三、各类状语从句详解
1. 时间状语从句
核心规则: 主将从现(主句将来时,从句一般现在时)
(1)when(当……时候)
从句可用瞬间动词或延续性动词
When I arrived, he was leaving.(瞬间)
When I was young, I lived here.(状态)
(2)while(在……期间)
从句动词必须延续,常用进行时
While I was reading, he came in.
(3)as soon as(一……就)
强调动作紧接着发生
I will call you as soon as I arrive.
(4)until(直到……)
延续动词 + until(一直等到)
瞬间动词 + not...until(直到……才)
I waited until he came back.
I didn't leave until he came back.
(5)before / after
before:在……之前
after:在……之后
2. 条件状语从句
核心规则: 主将从现
(1)if(如果)
If it rains tomorrow, we will stay at home.
(2)unless(除非,如果不)
= if...not
You will fail unless you study hard.
= You will fail if you don't study hard.
3. 原因状语从句
(1)because(因为)
语气最强,回答 why
I was late because I missed the bus.
(2)since / as(既然,由于)
表示已知的、显而易见的原因
Since everyone is here, let's start.
4. 目的状语从句
so that(以便)
从句常有 can/could/may/might
I got up early so that I could catch the bus.
5. 结果状语从句
(1)so...that(如此……以至于)
so + 形容词/副词 + that
The box is so heavy that I can't carry it.
(2)such...that(如此……以至于)
such + 名词短语 + that
It was such a hot day that we went swimming.
6. 让步状语从句
although / though(虽然)
不能与 but 同时使用!
Although it rained, we went out.( )
Although it rained, but we went out.( )
四、状语从句的位置
从句在前: 引导词 + 从句 + 逗号 + 主句
If it rains, we will stay at home.
从句在后: 主句 + 引导词 + 从句(不用逗号)
We will stay at home if it rains.
五、易错点与难点突破
1. 从句中误用将来时
If it will rain, we will stay at home.
If it rains, we will stay at home.
2. because 与 so 不能同时使用
Because it rained, so we stayed home.
Because it rained, we stayed home.
3. although 与 but 不能同时使用
Although it rained, but we went out.
Although it rained, we went out.
4. until 与 not...until 的混淆
I left until he came back.(left 是瞬间动词,应否定)
I didn't leave until he came back.
5. so 与 such 的混淆
so + 形容词/副词
such + 名词短语
so beautiful(形容词)
such a beautiful girl(名词短语)
六、思维导图总结
七、记忆口诀
状语从句口诀:
状语从句分六类,时间条件原因最;
目的结果和让步,引导词要记心间。
主将从现是铁律,will 不能从句现;
because/so 二选一,although/but 不同存。
until 用法要分清,延续肯定瞬间否;
so/such 看词性,形副用 so 名用 such。
1.I don't know if it ________ tomorrow, but if it ________, I'll stay at home.
A.will rain; rains B.will rain; will rain C.rains; rains
2.Tom rushed into the house his mother was cooking.
A.until B.before C.while D.after
3.The teacher with her students the park if it tomorrow.
A.is going to; won't rain B.are going to; won't rain
C.is going to; doesn't rain D.are going to; doesn't rain
4. —I don't like raining days, I feel too bored staying at home every day.
—Well. ____the rain stops, let's go to the mountains.
A.because B.until C.as soon as D.unless
5.I managed to arrive in time for the meeting ________ there was a lot of traffic.
A.until B.because C.if D.though
6. If a polar bear____, it____ fish from the water.
A.will be hungry; catches B.is hungry; will catch
C.is going to be hungry; catches D.is hungry; won't catch
7.—If you can't remember these words, I advise you to _________ them into your notebook for many times.
—I see. I will have a try.
A.copy B.watch C.decide
8. You can go to Yunnan Road ____ you want to try Shanghai local snacks.
A.because B.although C.until D.if
9. —Why do you like hiking
—____ it can keep me healthy.
A.Because B.So C.Though
10. As students, we should make full use of every bit of time ____ we can find more time to deal with the subject we are not good at.
A.as soon as B.so that C.although D.unless
11.My family will go on a trip to Nanjing if my father ____ free next month.
A.is B.was C.will be D.has been
12. we deal with our problems, we can easily become unhappy.
A.Until B.If C.Unless D.Though
13.Tom won't go to the zoo unless he __________ his homework.
A.finish B.finishes C.will finish D.Finishing
14. — I want to know when Mr Green will arrive.
—When he ____ , I will tell you.
A.will arrive B.arrived C.arrives D.is arriving
15.He turned up the radio _______ everyone could hear the good news.
A.so that B.as long as C.though D.in order to
16.________ what we eat for breakfast has a great effect on our health, many students skip breakfast.
A.Though B.Despite of C.In spite of D.In despite of
17. He fought against the big fish bravely, ____ he was very tired.
A.because B.though C.so
18.— I am going to study Chinese medicine at a university when I grow up.
— Great! ________ you try your best, then you can be anything you want.
A.As long as B.Although C.So
19.If he ______ time tomorrow, I ________ him to dinner.
A.has; will invite B.will have; will invite
C.has; invite D.will have; invite
20.I'm sure he will help her if she __________ him.
A.asked B.asks C.would ask D.had asked
21. The story is ____ interesting ____ everyone wants to read it.
A.too; to B.so; that C.such; that
22.The little boy succeeded in reaching the camp, ________ he fell over several times all the way.
A.until B.but C.even though D.so that
23.—My brother was reading the newspaper ____ I was doing my homework.
—You both did well.
A.before B.so C.while
24.It was raining hard _______ I got up this morning.
A.if B.when C.after D.until
25.The sky is bluer ________ we have taken action to protect the environment.
A.because B.before C.until D.unless
26.You'll find out the truth ________ you finish reading the book.
A.unless B.or C.if D.though
27. ____ the rule is strict, it is necessary for our safety.
A.Although B.If C.So D.But
28. If it is necessary, you should ____ the unknown words in your dictionary while reading.
A.give up B.look up C.put out D.work out
29. If you____ him, you will____ this match.
A.win; beat B.win; win C.beat; win D.beat; beat
30. Our teacher advises us to watch news every day ____ we can find out what's going on around the world.
A.so that B.because C.when D.but
31.Zhang Guimei once said, " _______ I'm alive, I will donate (献身) myself to teaching."
A.Even though B.As soon as C.As long as D.So that
32.________ I got back, I found my mother cooking for me.
A.Since B.Before C.When
33.Anna learns a lot about Anhui's history she can become a tour guide in the future.
A.if B.because C.although D.so that
34.The important concert will begin soon. If he _________________ the bus, he will be late.
A.will take B.take C.takes
35. You have to get up early tomorrow ____ you can catch the early bus.
A.as soon as B.so that C.because D.if
36. ____ you like to eat eggs or not, you should eat one every day.
A.Whether B.If C.Although
37.I can't go to the concert with you ______ I have to finish the report tonight.
A.or B.while C.so D.because
38.You _______ out unless you _______ all the work.
A.can't go, finish B.can go, don't finish
C.go, finish D.can't go, don't finish
39. They might not know how you feel ____ you talk to them.
A.although B.if C.until D.so
40. —If you don't take your study too ____, you must be sorry one day.
—Really I think I should follow your words.
A.serious B.seriously
C.most serious D.most seriously
41.If Gina ________ some vegetables, she won't have to buy them.
A.grows B.grew C.will grow D.is growing
42.You can't go to the library ______ you don't have a student ID card.
A.because B.unless C.if
43.In summer milk will quickly go bad ______ it put into a fridge.
A.though. B.unless C.because
44.He is going to be a teacher when he ________.
A.grow up B.grows up C.will grow up D.grew up
45. The girl wanted to make a lot of money ____ she could buy the silk cheongsam.
A.and B.but C.so that D.because
46.If you any question, you Mrs. Smith.
A.have: call B.will have: call
C.have; can call D.will have; can call
47. The girl is ____ young ____ she can't go to school.
A.too; to B.so; that C.such; that D.enough; to
48. ____ he is very tired, ____ he still helps his mom do the housework.
A.Although, but B./, /
C.Although, / D.Although, however
49. The camera is ____ expensive ____ I can't afford it.
A.so; that B.such; that C.so; as to D.enough; that
50. If it ____ tomorrow, we will stay at home.
A.rain B.rains C.will rain D.rained
参考答案及试题解析
1.A
【解析】句意:我不知道明天是否会下雨,但如果下雨,我会待在家里。第一空,根据语境"I don't know if it…tomorrow"可知,此处应是if引导宾语从句,从时间状语"tomorrow"可知,从句用一般将来时"will do"。第二空,根据"but if it…, I'll stay at home."可知此处if引导条件状语从句,遵循"主将从现"原则,从句中用一般现在时,主语是it,谓语动词应用第三人称单数形式。故选A。
【点评】考查if引导的主从复合句。注意识记if引导的主从复合句的用法。
2.C
【解析】句意:汤姆妈妈做饭时,他冲进了房子。A.直到……时;B.在……之前;C.当……的时候;D.在……之后。根据Tom rushed into the hous和his mother was cookin是同时进行的,故选C。
【点评】考查连词辨析和时间状语从句,注意while引导的时间状语从句。
3.C
【解析】句意:如果明天不下雨,老师和学生们将去公园。句子的主语是The teacher with her students,with her students是伴随,所以主语是第三人称单数,所以排除B,D;主句是将来时时,if 引导的条件状语从句用一般现在时代替将来时,故答案为C。
【点评】考查主谓一致。掌握主语含有with表示伴随情况时,谓语只看with前面的名词或代词,要与其保持一致。
4.C
【解析】句意:——我不喜欢下雨天,每天呆在家里我觉得太无聊了。——嗯。雨一停,我们就去山上。 A:because因为;B:until直到;C:as soon as一……就;D:unless除非。分析前后语境可知,此处雨停是上山的条件,排除A和B项。又根据let's go to the mountains可知,是雨一停就上山,故选C。
【点评】本题考查条件状语从句,注意对引导词的积累和运用。
5.D
【解析】句意:尽管交通很拥堵,我还是设法准时赶到了会议现场。until 直到……为止;because 因为;if 如果;though 尽管。结合语句 "I managed to arrive in time for the meeting … there was a lot of traffic." 可知,"准时赶到会议"和"交通拥堵"之间是转折关系,though用来引导让步状语从句,符合句子逻辑,其他连词的语义与语境不匹配,因此though为正确答案,故答案为D。
【点评】考查连词的词义辨析。解题需牢记:though引导让步状语从句,表示"尽管、虽然";because引导原因状语从句;if引导条件状语从句;until引导时间状语从句。
6.B
【解析】句意:如果北极熊饿了,它会从水里抓鱼。will be healthy=is going to be hungry将会饿,一般将来时;is hungry是饿的,一般现在时;catches抓住,动词的三单形式;will catch将会抓住,一般将来时;won't catch不会抓住。分析句子为if引导的条件状语从句,遵循主将从现,从句主句为单数形式,be动词应用is,可知此处应用is hungry;结合句意,此处是指如果北极熊饿了,它就会从水里抓鱼,主句时态为一般将来时,结构为will do,可知此处应用will catch,故选B。
【点评】考查条件状语从句,注意识记If引导的条件状语从句的用法,选出正确答案。
7.A
【解析】句意:—— 如果你记不住这些单词,我建议你把它们多次抄写到笔记本上。—— 我明白了。我会试试的。copy 抄写;watch 观看;decide 决定。结合语句 "If you can't remember these words, I advise you to…them into your notebook for many times."可知,此处表示将单词 "抄写" 到笔记本的动作,"copy" 符合语境。"watch"(观看)和 "decide"(决定)均与 "到笔记本里" 这一语境不匹配。故答案为A。
【点评】考查动词词义辨析。解题关键在于结合 "到笔记本里" 这一语境,推断出对应的动作是 "抄写",进而选出符合逻辑的选项。
8.D
【解析】句意:如果你想尝尝上海当地的小吃,你可以去云南路。A.因为,表示原因;B.尽管,表示让步;C.直到;D.如果,表示条件。You can go to Yunnan Road你可以去云南路,you want to try Shanghai local snacks你想尝尝上海当地的小吃,可知讲的是你可以去云南路的条件是你想尝尝上海当地的小吃,故选D。
【点评】考查连词辨析,首先理解连词词义,然后根据前后句句意确定连词。
9.A
【解析】句意:——你为什么喜欢徒步旅行?——因为它能让我保持健康。Because因为;So所以;Though虽然。结合语句"Why do you like hiking ……it can keep me healthy."可知,why提问原因,用because回答,故选A。
【点评】考查连词的用法。because用来回答why引导的问句。
10.B
【解析】句意:作为学生,我们应该充分利用每一点时间,以便找到更多的时间来应对我们不擅长的科目。as soon as一……就……;so that以便于,以致于;although尽管,即使;unless除非。根据"we can find more time to deal with the subject we are not good at"可知,我们充分利用时间的目的是为了有更多时间应对薄弱科目,用so that引导目的状语从句。故选B。
【点评】考查从属连词辨析。注意首先分析句子内部语义上的逻辑关系,结合选项所给连词的具体用法选择正确的连词。
11.A
【解析】句意:如果我爸爸下个月有空的话,我们全家将去南京旅游。A.is,是,谓语动词单数,一般现在时;B.was,过去式,谓语动词单数;C.will be将会,将来时;D.has been已经,现在完成时。根据语境"My family will go on a trip to Nanjing if my father...free next month"可知,此处应是if引导的条件状语从句,遵循主将从现原则。主句将来时,从句一般现在时,故选A。
【点评】考查条件状语从句。注意识记if引导的条件状语从句,遵循主将从现原则。
12.C
【解析】句意:如果我们不解决我们的问题,我们就很容易变得不开心。until“直到”;if“假如,是否”,表示条件或假设;unless“除非,如果不”,在意义上相当于if...not;though“尽管”,表示让步。故答案为C。
【点评】考查连词辨析。熟记单词,理解句意,根据前后的逻辑关系判断答案。
13.B
【解析】根据主将从现规则,本空应填一般现在时,主语为第三人称故选B。
14.C
【解析】句意:——我想知道格林先生什么时候到。——当他到达时,我会告诉你。will arrive一般将来时,arrived动词过去式,arrives动词三单形式,is arriving现在进行时;I don't know 后接宾语从句,when什么时候,引导宾语,根据When he...,I will tell you.可知,when当……的时候,引导时间状语从句,遵循主将从现,从句用一般现在时,he主语,谓语动词要用第三人称单数形式,故选C。
【点评】考查时态辨析。注意识记时态,掌握when的用法,引导时间状语从句,遵循主将从现的原则。
15.A
16.A
【解析】句意:尽管早餐吃什么对我们的健康有很大影响,但许多学生不吃早餐。Though虽然,连词,可引导从句;Despite of形式错误,正确形式应为despite"即使;尽管",介词;In spite of为"尽管",介词短语,后需接名词或名词短语,不能直接引导从句;In despite of形式错误,不存在该短语。空格后"what we eat for breakfast has a great effect on our health"为完整的句子,应用"Though"引导让步状语从句。故选A。
【点评】考查让步状语从句,首先理解选项区别,然后根据前后句句意确定答案。
17.B
【解析】句意:他勇敢地与大鱼搏斗,尽管他非常累。A. because因为;B. though尽管,虽然;C. so所以。根据"He fought against the big fish bravely"和"he was very tired"可知,前后是让步关系,即尽管他很累,但还是勇敢地与大鱼搏斗,用though引导让步状语从句,故答案为:B。
【点评】考查连词辨析。注意准确理解各连词的含义和用法,根据句子所表达的逻辑关系。
18.A
【解析】句意:——我长大后要去大学学习中医。 ——太棒了!只要你尽了最大的努力,你就能成为任何你想成为的人。As long as只要;Although虽然,尽管;So所以。根据then you can be anything you want你就能成为任何你想成为的人,可知应是表示只要尽力,就能成为你想成为的人,应用固定搭配as long as"只要"。故选A。
【点评】考查短语辨析。注意熟记固定搭配as long as"只要"。
19.A
【解析】句意:如果他明天有时间,我将会邀请他吃晚餐。if引导的条件状语从句,主句用一般现在时,从句用一般将来。he做主语为第三人称单数,所以用has。invite sb. to do sth.邀请某人做某事。故选A。
【点评】本题考查if引导的条件状语从句,是要求考生掌握的基本从句句型。
20.B
【解析】句意:我确信如果她求助于他,他会帮助她的。A过去式,B单三式,C过去将来时,D过去完成时,if引导条件状语从句,时态是主将从现,从句用一般现在时,主语是第三人称单数,故用单三式,故选B。
【点评】考查时态,注意识记一般现在时,if引导条件状语从句,时态是主将从现的用法。
21.B
【解析】句意:这个故事是如此有趣以至于每个人都想读 它。 too…to太……以至于不能……,too 后接形容词或副词,to后跟动词原形,不能接句子; so...that如此……以至于;引导的结果状语从句, so后接形容词或副词,that接结果状语从句 ; such…that如此……以至于,such后接名词,that后接从句;根据句子everyone wants to read it ( 每个人都想读它),排除A选项;第一个空后面为形容词interesting,后面没有名词,不能用such,排除C选项,B选项符合so+形容词+that从句的结构,故答案为B。
【点评】考查结果状语从句。掌握so…that的意义和固定搭配的用法区别。
22.C
23.C
【解析】句意:我哥哥在看报纸,我在做作业。——你们俩都做得很好。 A:之前;B:所以;C:while当……的时候。根据 You both did well.你们俩都做得很好,可知应是看报纸和做作业的动作同时发生,应用while。故选C。
【点评】考查连词辨析。注意熟记while表示"当……时候"或"与此同时",用于描述两个动作同时发生。
24.B
【解析】句意:今天早上当我起床的时候,雨正下得很大。A: if如果 B: when当……时 C: after在……之后 D: until 知道 ,此处应是当我起床时,雨下得大,符合句意,故选B。
【点评】考查when引导的时间状语从句。注意连词的含义和用法区别。
25.A
【解析】句意:天空更蓝了,因为我们已经采取行动保护环境。because 因为;before在……之前;until直到;unless 除非。根据"we have taken action to protect the environment"可知,此处是表示原因,用because引导原因状语从句。故选A。
【点评】考查连词辨析,首先理解连词词义,然后根据前后句句意确定连词。
26.C
【解析】句意:如果你读完这本书,你将发现真理。发现真理的前提,是读完这本书,条件状语从句,用if或者unless引导。if引导的条件状语从句,主句一般是肯定句;unless引导的则为否定句。此处主句是肯定句,用if。故选C。
【点评】考查条件状语从句,注意if和unless的不同。
27.A
【解析】句意:虽然规则很严格,但这对我们的安全是必要的。Although虽然; If如果;So所以; But但是。根据"the rule is strict, it is necessary for our safety."可知,逗号前后两个句子在语义上构成让步关系,故空处表示"虽然/尽管"。故选A。
【点评】考查连词辨析。注意:1. 分析句子结构。首先,明确空缺处前后是分句、短语还是单词,判断是否需要连词(如并列连词and/or/but)或从属连词(because/although/when)。若连接两个独立分句,需确认是并列关系(用逗号+并列连词)还是主从关系(用从属连词)。2. 识别逻辑关系。根据上下文判断逻辑类型:因果关系(therefore、because/since/as),转折关系(but/yet,although/even though),条件关系(unless(=if not), provided that),时间关系(while, as soon as)3. 排除干扰项。以词性、逻辑关系以及固定搭配为根据一一排除错误选项。4. 验证答案。将所选连词代入,检查是否通顺。5.注意高频易错点。如,while可能表时间("当…时")或对比("尽管");as可表原因("由于")或时间("随着"),需结合语境;since时间状语从句用一般过去时,原因状语从句常用现在完成时。
28.B
【解析】句意:如果有必要,你应该边读边查字典。A:放弃; B:查找; C:put out扑灭;D:work out解决。根据 the unknown words in your dictionary ,可知应是在字典上查找不认识的单词,应用固定搭配look up"查找"。故选B。
【点评】考查短语辨析。注意熟记固定搭配look up"查找"。
29.C
【解析】句意:如果你……他,你就会……这场比赛。win赢,动词,通常用于比赛、选举、战争等中获胜或赢得某物,其宾语是比赛、战争、奖品、金钱等名词。beat打败,动词,通常用于在比赛中打败对手,其宾语通常是人或队伍,第一空后为him(他),要用beat,第二空后为match(比赛),要用win,故答案为C。
【点评】考查动词辨析。注意win通常用于比赛、选举、战争等中获胜或赢得某物,beat通常用于在比赛中打败对手。
30.A
【解析】句意:我们老师建议我们每天看新闻以便我们能发现全世界在发生什么。A:so that,意为"以便于",常用于引导目的状语从句,B:because,意为"因为",常用于引导原因状语从句,C:when,意为"当......时候",常用于引导时间状语从句,D:but,意为"但是",表转折关系,不符合题意。每天看新闻的结果是能够了解世界上的事情。所以用so that引导结果状语从句。故选A。
【点评】考查连词辨析,应根据句子选择合适的连词。结合题目中的语境和常识来判断选项的正确性。
31.C
32.C
【解析】句意:……我回来,我发现我妈妈在为我做饭。根据句意可知应该为当我回来的时候,故选C。
【点评】考查从句的应用。
33.D
34.C
【解析】句意:重要的音乐会马上就要开始了。如果他坐公共汽车,他就会迟到。A.将乘坐,一般将来时;B.乘坐,一般现在时,动词原形;C.乘坐,一般现在时,单三式。if引导的条件状语从句,从句用一般现在时,主句用will+动词原形,if所在句子是从句,所以用一般现在时,主语是单数he,所以take用单三式takes,故选C。
【点评】考查条件状语从句,注意平时识记if引导的条件状语从句,从句用一般现在时,主句用will+动词原形。
35.B
【解析】句意:今天你得早一点起,这样你才能赶上早班车。A一......就,引导时间状语从句,B这样,引导结果状语从句,C因为,引导原因状语从句,D如果,引导条件状语从句,get up early tomorrow的结果可能是you can catch the early bus,故选B。
【点评】考查大连词,注意识记so that的用法。
36.A
【解析】句意:不管你喜不喜欢吃鸡蛋,你都应该每天吃一个。A:Whether是否;B:If如果;C:Although虽然。固定搭配whether...or not,是否,此处是指不管你是否喜欢鸡蛋,可知此处应用Whether,故选A。
【点评】考查连词辨析,注意识记whether...or not的用法。
37.D
【解析】句意:我不能和你一起去听音乐会,因为我今晚得完成报告。A: or 否则,或者;B: while 当......时,然而;C: so因此; D: because因为。根据前后句的意思,可知后句是前句的原因,故选D。
【点评】考查连词辨析。理解连词的词义和用法,根据前后句的关系,选择正确的连词。
38.A
【解析】句意:除非你完成所有的工作,否则你不能出去。根据语境和语言表达习惯可知一般是写完作业才能出去。unless是除非,如果不的意思,连接的条件状语从句,主句和从句肯否相反,unless连接的主句用否定,表示不能出去,从句用肯定,表示完成作业,故答案为A。
【点评】本题考查条件状语从句,注意unless连接的条件状语从句。
39.C
【解析】句意:他们可能不知道你的感受,直到你和他们谈谈。although虽然,尽管;if如果;until直到;so所以。结合语句 "They might not know how you feel … you talk to them." 可知,本句考查not…until…结构,意为"直到……才……",故选C。
【点评】考查连词及固定结构。not…until…表示"直到……才……"。
40.B
【解析】句意:——你如果你不认真学习,总有一天你会后悔的。——真的吗?我觉得我应该听你的话。A:认真的(形容词);B:认真地(副词);C:最认真的(形容词最高级,缺少定冠词the);D:最认真地(副词最高级,缺少定冠词the)。根据副词作状语修饰动词,可知此处应用副词修饰谓语动词take,表示对待的态度,排除AC;再根据空格前副词too,用于修饰形容词/副词,可知用副词原级即可。故选B。
【点评】考查副词原级。注意熟记 "too"是一个程度副词,常用来表示某事物超过了合适的、正常的或期望的程度,它主要用于修饰形容词和副词 。
41.A
【解析】句意:如果吉娜种植一些蔬菜,她就不必去购买它们。A一般现在时,主语是第三人称单数;B一般过去时;C一般将来时;D现在进行时。if引导的条件状语从句中遵循"主将从现"原则,即主句用一般将来时,从句用一般现在时。从句主语是第三人称单数,动词用三单形式。故选A。
【点评】考查时态。注意识记if引导的条件状语从句中遵循"主将从现"原则。
42.A
【解析】句意: 你不能去图书馆,因为你没有学生证。 A.因为;B.除非;C.如果。根据 you don't have a student ID card 是 You can't go to the library 的原因可知,此句是because引导的原因状语从句。故选A。
【点评】考查状语从句,注意because引导的原因状语从句的用法。
43.B
【解析】句意: 夏天,牛奶会很快变质,除非放入冰箱。though虽然;unless除非;because因为。根据常识,在夏天,牛奶如果不放入冰箱,很快就会变质。 故选B。
【点评】考查连词辨析,理解选项意思,选出正确答案。
44.B
【解析】句意:当他长大以后,他打算成为一名教师。grow up长大,动词原形;grows up长大,第三人称单数形式;will grow up长大,一般将来时态;grew up长大,一般过去时态。when引导的时间状语从句中,需使用一般现在时表示将来,主语he是第三人称单数,因此谓语动词需用第三人称单数形式grows up。故选B。
【点评】考查when引导的时间状语从句,首先理解选项区别,然后识记when引导的时间状语从句的用法,理解句意。
45.C
【解析】句意: 这个女孩想赚很多钱,以便能买那件丝绸旗袍。and和/并且;but但是;so that以便/为了(表目的);because因为(表原因)。分析句子语境可知,"这个女孩想赚很多钱"是为了"买那件丝绸旗袍",故此处表示目的,应用so that引导目的状语从句。故选C。
【点评】考查目的状语从句。注意:根据上下文判断逻辑类型:因果关系,转折关系,条件关系,时间关系。以词性、逻辑关系以及固定搭配为根据一一排除错误选项。
46.C
【解析】句意:如果你有任何问题,你可以给史密斯夫人打电话。此句为条件状语从句,时态为主将从现,故选C.
【点评】考查学生对条件状语从句时态的掌握。
47.B
【解析】句意:这个女孩太小了,以至于她不能去上学。too...to太……而不能;so...that如此……以至于;such...that如此……以至于;enough...to足够……去做。空格后是完整的句子,"too...to"和"enough...to"后要接动词原形,不符合此处结构;"such"后接名词,"young"是形容词,"so"后接形容词或副词,"so young"符合搭配,能引导结果状语从句,故选B。
【点评】本题考查连词短语的辨析,关键注意事项是要区分不同连词短语的结构和用法,结合空格后内容的句式来判断适配的短语,同时注意"so"和"such"在修饰词性上的区别。
48.C
【解析】句意:尽管他很累,但是他仍然帮助他妈妈做家务。 Although虽然;but但是;however然而。 结合语义两个句子之间存在相反的让步关系或转折关系,前面如果用although(尽管)引导让步状语从句,后面的句子不能用but;如果后面的句子有but(但是)表转折,前面的句子不能用although。however表转折时,后用逗号; 故答案为C。
【点评】考查让步状语从句。理解题意并掌握although和but不能并用于句中的用法。
49.A
【解析】这个相机如此的贵以至于我买不起。A"so…that…"表示"如此……以致于……",其中"so"后接形容词或副词,表示程度,"that"后接结果状语从句。B"such…that…"也表示"如此……以致于……",但"such"后接名词。C"so…as to…"表示"如此……以至于……",但"as to"后面通常接动词原形,不接句子。 D"enough…that…"这个结构在英语中并不常见,且"enough"通常用于"形容词/副+enough+to do sth."的结构中,表示"足够……以至于能做某事"。根据句意和语法结构,前半部分"expensive"是形容词,描述相机的价格,后半部分"I can't afford it"是一个完整的句子,表示买不起的结果。因此,需要一个能连接形容词和句子的连词短语。在这里,"so…that…"是最合适的选择,因为它可以连接形容词和结果状语从句。故选A。
【点评】考查状语从句。注意区分so...that,such...that,enough to do等结构的用法。
50.B
【解析】句意:如果明天下雨,我们就呆在家里。A.下雨,一般现在时的;B.下雨,一般现在时;C.将下雨,一般将来时;D.下雨,一般过去时。if引导的时间状语从句,从句用一般现在时,主句用will+动词原形,从句主语是单数it,所以rain用单三式rains,故选B。
【点评】考查if引导的条件状语从句,注意根据关键词it确定谓语形式,理解句意。
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