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中小学教育资源及组卷应用平台
8B Unit6 重点语法提升练
单元语法：it’s adj. (for或of) sb to do
It is adj. to do sth. 谈论做某事的感受
It is adj. for sb. to do sth 谈论某人做某事的感受
It is adj. of sb. to do sth 评价某人的行为
考点一 It is +adj.+ to do
1 It is +形容词+带to的不定式，在该句型结构中，It为形式主语，真正的主语为其后的动词不定式。 eg：It is useful to have support teams to bring you food and drinks.有支援队给你带来食物和饮料是有用的。
It Is wise to take a map and a mobile phone. 带地图和手机是明智的。
2 动词不定式结构也可以直接置于句首担当句子主语。
eg:To train yourself before the walk is necessary. 在行走前训练自己是必要的。
To clean the parks before National Day is im portant. 在国庆节前清扫公园是重要的。
考点二 It is + adj. + for... + to do
It is +形容词+ for... +带to的不定式，在该句型结构中，动词不定式结构的逻辑主语就是for 后面的人或物。该句型中形容词用来描述事物的性质，此类形容词有:easy, important, difficult, possible, hard, interesting, funny, useful, strange, expensive, pleasant, simple 等。
eg：It is important for us to learn English well. 对我们来说把英语学好是重要的。
It is impossible for her to finish the work in an hour.要她一小时内完成这项工作是不可能的。
考点三 It is + adj. + of... + to do
It is +形容词+of...+带to的不定式,该句型结构中it是形式主语，动词不定式是真正的主语。of后面的sb.是不定式的逻辑主语。of前用表示人的性格、品质或特征的形容词。如：kind, nice, clever, polite, generous, foolish, silly, pa tient ,rude, hard-working 等
eg： It is generous of John to donate much money to charities. 约翰真慷慨，捐许多钱给慈善机构。
It is lazy of you not to finish your homework on time.你真懒，不按时完成家庭作业。
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．It is important ________ us ________ the oceans clean for marine animals.
A．for; to keep B．of; to keep C．for; keeping
2．It is cruel ________ people ________ animals for their fur or tusks.
A．of; to kill B．for; to kill C．of; killing
3．—I don’t like learning maths. It’s too difficult ________ me to learn it.
—But maths is very useful. It’s silly ________ you to drop it.
A．of; for B．for; of C．of; of D．for; for
4．It is important _________ a healthy lifestyle.
A．of us to have B．for us having C．of us having D．for us to have
5．It’s not ________ for you to jump on such a high mountain.
A．safe B．safety C．safely D．save
6．It’s easy _________ plastic bottles, but it’s bad for the earth.
A．throw B．to throw C．throwing D．throws
7．It’s necessary ________ us ________ those in need.
A．for; to help B．for; helping C．of; to help D．of; helping
8．It is convenient ________ us ________ about the world online.
A．for; learn B．of; to learn C．for; to learn
9．It’s necessary ________ students to learn basic art skills.
A．for B．of C．to D．with
10．It’s interesting ________ a poem together in class.
A．read B．to read C．reading D．reads
11．He thinks it’s difficult ________ all the students’ names in the first class.
A．to remember B．remembering C．remembers D．remember
12．It’s interesting for me ________ part in the drawing competition.
A．take B．to take C．taking D．took
13．There are so many important things in the textbook. ________ difficult for us ________ all the information.
A．It’s, remembering B．It’s, to remember
C．They are, remembering D．They are, to remember
14．It’s strange ________ a letter in the digital age, but the handwritten words inside warmed my heart.
A．receive B．received C．receiving D．to receive
15．It’s helpful for old people ________. Not only ________ them keep healthy, but it can also help their brains.
A．exercising; it helps B．to exercise; it can help C．to exercise; can it help
16．It’s kind ________ you to help me learn English.
A．of B．for C．about D．with
17．It would be fun ________ with children. We can feel happier with them.
A．playing B．played C．to play D．plays
18．Nowadays, AI technology ________ to improve traditional methods of learning, and it’s necessary for us ________ it.
A．has used; learning about B．is used; to learn about C．is using; to learn about
19．Usually, ________ is difficult ________ a boy of five years old to dress himself.
A．that; for B．that; of C．it; for D．it; of
20．_______ is dangerous for us to swim in the river.
A．This B．That C．There D．It
21．It is not easy for my deskmate ________ negative feelings in her life.
A．deals with B．to deal with C．deal with D．dealing with
22．—It’s hard ________ students to get 100 in such a difficult exam, but you make it, Lucy!
—Actually, I should thank you. It’s so kind ________ you to help me with my study.
A．for; of B．for; for C．of; for D．of; of
23．It’s clever ________ her ________ it easily.
A．of; to solve B．for; to solve C．of; solving D．for; solving
24．Don’t speak loudly. It’s polite ________ your voice down in public.
A．keep B．to keep C．keeping
25．It is kind________ you to________.
A．of; pick me up B．for; pick up me C．of; pick up me
26．—It is convenient ________ us ________ things online.
—So it is.
A．for; to buy B．of; to buy C．for; buy D．of; bought
27．It is easy ________ us ________ some useful information on the Internet.
A．of; to get B．of; get C．for; to get D．for; get
28．—I left my math book at home this morning. Bill shared his ________ me.
—It’s necessary ________ students to help each other.
A．with; of B．to; for C．with; for
29．It is dishonest __________ you __________ when you make mistakes.
A．for; to tell lies B．of; to tell lies C．for; telling lies D．of; telling lies
30．It’s nice ________ you all.
A．meet B．meets C．to meet D．meeting
31．It’s silly ________ you ________ others for their faults.
A．for, not forgive B．of, not forgive C．for, not to forgive D．of, not to forgive
32．It’s difficult for us ________ the difference between the two similar words.
A．understand B．to understand C．understanding D．understood
33．Next to my dad ________ my grandparents. It’s really kind ________ them to help people in need.
A．is, of B．is, for C．are, of
34．To improve your English, it’s important to ________ every chance to practice.
A．makes use of B．make use of C．making use of D．made use of
35．________ necessary to protect endangered animals.
A．It’s B．That’s C．There’s D．What’s
36．It’s polite ________ “Excuse me” when you want to pass by someone.
A．say B．to say C．saying D．said
37．It’s dangerous _________ on the thin ice.
A．skate B．skating C．to skate D．skates
38．________ great fun _________ so much about the world around us.
A．We are, to learn B．It’s, to learn C．We are, learning D．It’s, learning
39．It’s not easy for each of the students ________ a healthy diet. Parents should help them with it.
A．have B．having C．has D．to have
40．It’s useful for us ________ different kinds of books. We have lots of fun ________.
A．to read; to read B．reading; reading C．to read; reading D．reading; to read
二、选词填空（每小题1分，共10分）
选 (of,或for)完成句子
41．It’s too expensive me to buy the computer.
42．It’s difficult me to learn Japanese.
43．It’s kind you to say so.
44．It’s impossible Tom to get home on time.
45．It is too easy him to solve the problem.
46．It’s clever her to work out the problem in 2 minutes.
47．It is too late the students to apologize.
48．It is careless you to make so many mistakes.
49．It is necessary us not to read in the dark.
50. It’s brave ______ her to speak in public.
三、完成句子（每小题2分，共10分）
51．医生认真倾听患者很重要。
important doctors carefully to patients.
52．Eating too much junk food is unhealthy for teenagers. (改为同义句)
unhealthy for teenagers eat too much junk food.
53．The boy is very clever. He can work out difficult problems. （合并为一句）
It is very clever the boy work out difficult problems.
54．She gave me a bottle of water. She was very nice. (合并为一句)
It was very nice to give me a bottle of water.
55．Tom is smart. He always learns new things fast. (合并为一句)
It’s smart Tom new things fast.
答案与解析
一、单项选择（每小题1分，共40分）
1．It is important ________ us ________ the oceans clean for marine animals.
A．for; to keep B．of; to keep C．for; keeping
【答案】A
【详解】句意：对我们来说，保持海洋清洁对海洋动物很重要。
考查it固定句型。根据“It is important ... us ... the oceans clean for marine animals.”可知，句子属于“It is + adj. + for/of sb. + to do sth.”句型，表示“对某人来说做某事是……的”，其中“It”为形式主语，真正的主语是后面的动词不定式短语；“for sb.”强调客观情况，“of sb.”通常用于描述人的品质 (如kind, nice等)。第一空，空格前“important”描述的是“保持海洋清洁”这件事的性质，应用for；第二空，用不定式短语“to keep the oceans clean for marine animals”作真正主语。故选A。
2．It is cruel ________ people ________ animals for their fur or tusks.
A．of; to kill B．for; to kill C．of; killing
【答案】A
【详解】句意：人们为了获取皮毛或象牙而杀害动物是残忍的。
考查It固定句型。本句是句型It’s+形容词+of/for sb to do sth，当形容词描述人的品质或性格（如kind, cruel, clever等）时，用of；当形容词描述事物特征（如important, necessary, easy等）时，用for。本句中“cruel（残忍的）”形容人的品质，因此用of；后接不定式“to kill”作真正主语。故选A。
3．—I don’t like learning maths. It’s too difficult ________ me to learn it.
—But maths is very useful. It’s silly ________ you to drop it.
A．of; for B．for; of C．of; of D．for; for
【答案】B
【详解】句意：——我不喜欢学数学。对我来说学它太难了。——但是数学很有用。你放弃它太傻了。
考查“It’s+形容词+for/of sb.+to do sth.”结构辨析。for sb.常用于表示某事对某人来说具有某种特征，形容词多为描述事物性质的，如important, necessary, difficult等；of sb.常用于表示某人本身具有某种品质，形容词多为描述人的性格、品德的，如kind, nice, silly, clever等。第一空，形容词“difficult”描述的是“to learn it”这件事的性质，应用“for me”。第二空，形容词“silly”描述的是“you”这个人的行为是愚蠢的，应用“of you”。故选B。
4．It is important _________ a healthy lifestyle.
A．of us to have B．for us having C．of us having D．for us to have
【答案】D
【详解】句意：拥有健康的生活方式对我们来说是重要的。
考查it的固定句型。分析句子可知it是形式主语，应用不定式作真正主语。“对某人来说做某事是……的”用句型“It is+adj.+for sb. to do sth.”或“It is+adj.+of sb. to do sth.”，用of时，形容词修饰人的性格品质；用for时，形容词修饰事物的特点。这里表示“拥有健康的生活习惯是重要的”，应用介词for。故选D。
5．It’s not ________ for you to jump on such a high mountain.
A．safe B．safety C．safely D．save
【答案】A
【详解】句意：在这么高的山上跳跃对你来说是不安全的。
考查词性辨析。safe安全的，形容词；safety安全，名词；safely安全地，副词；save拯救，动词。根据句型“It’s + adj +for sb to do sth”可知，此处需用形容词描述“不安全”的状态。故选A。
6．It’s easy _________ plastic bottles, but it’s bad for the earth.
A．throw B．to throw C．throwing D．throws
【答案】B
【详解】句意：扔掉塑料瓶很容易，但对地球有害。
考查固定句型。“It’s + adj + to do sth.”是固定句型，意为“做某事是……的”，因此空格处应填不定式to throw。故选B。
7．It’s necessary ________ us ________ those in need.
A．for; to help B．for; helping C．of; to help D．of; helping
【答案】A
【详解】句意：对我们来说，帮助那些需要帮助的人是必要的。
考查固定句型。It’s necessary for sb. to do sth.是固定句型，意为“对某人来说做某事是必要的”。故选A。
8．It is convenient ________ us ________ about the world online.
A．for; learn B．of; to learn C．for; to learn
【答案】C
【详解】句意：在网上了解世界对我们来说是方便的。
考查介词用法和非谓语动词。根据“It is convenient ... us ... about the world online.”可知，此处考查“It is + adj. + for/of sb. + to do sth.”句型。形容词convenient表示“方便的”，通常与介词for搭配，表示“对某人来说做某事是方便的”，排除B；在这一句型中，“It”为形式主语，真正的主语是后面的动词不定式短语，排除A。故选C。
9．It’s necessary ________ students to learn basic art skills.
A．for B．of C．to D．with
【答案】A
【详解】句意：学习基本艺术技能对于学生来说是必要的。
考查介词辨析。“It’s +形容词 +for sb. to do sth.”固定句型，意为“对于某人来说做某事是……的”。句型中的形容词描述“做某事的性质”。若形容词描述“人的品质”时，此句型应为“It’s +形容词+of sb. to do sth.”，意为“某人做某事真是太……了”。“necessary”描述“做某事的性质”，要选用介词for，故选A。
10．It’s interesting ________ a poem together in class.
A．read B．to read C．reading D．reads
【答案】B
【详解】句意：在课堂上一起读一首诗很有趣。
考查动词不定式的用法。在“It’s + 形容词”结构中，后接动词不定式（to do）表示“做某事是……的”，此处强调“读诗”这一行为很有趣。故选B。
11．He thinks it’s difficult ________ all the students’ names in the first class.
A．to remember B．remembering C．remembers D．remember
【答案】A
【详解】句意：他认为在第一节课上记住所有学生的名字很难。
考查非谓语动词。此处用固定句式“it’s adj. to do sth.”意为“做某事是……的”，此处用动词不定式to remember作从句真正的主语。故选A。
12．It’s interesting for me ________ part in the drawing competition.
A．take B．to take C．taking D．took
【答案】B
【详解】句意：对我来说，参加绘画比赛很有趣。
考查非谓语动词。根据“It’s interesting for me...part in the drawing competition.”可知，此处是“It is+adj.+for sb.+to do sth.”，表示“对某人来说，做某事是……的”，其中it是形式主语，动词不定式作真正主语。故选B。
13．There are so many important things in the textbook. ________ difficult for us ________ all the information.
A．It’s, remembering B．It’s, to remember
C．They are, remembering D．They are, to remember
【答案】B
【详解】句意：课本里有太多重要的知识点，我们很难记住所有内容。
考查it固定句型。根据“...difficult for us...all the information.”可知，此处应用“It’s+adj.+for sb. to do sth.”句型表示“对于某人来说，做某事是……的”，其中it作形式主语，真正的主语为不定式短语。故选B。
14．It’s strange ________ a letter in the digital age, but the handwritten words inside warmed my heart.
A．receive B．received C．receiving D．to receive
【答案】D
【详解】句意：在数字时代收到一封信很奇怪，但里面的手写字温暖了我的心。
考查it固定句型。本句为“It is + adj. + to do sth.”结构，it作形式主语，动词不定式作真正主语。因此空格处应用to receive。故选D。
15．It’s helpful for old people ________. Not only ________ them keep healthy, but it can also help their brains.
A．exercising; it helps B．to exercise; it can help C．to exercise; can it help
【答案】C
【详解】句意：对老年人来说，锻炼是有帮助的。它不仅可以帮助他们保持健康，还有利于他们的大脑。
考查非谓语动词和倒装句。exercise锻炼。第一空考查“It’s+形容词+for sb to do sth”结构，用to exercise；第二空“not only”位于句首时，句子要部分倒装，将情态动词can提至主语it前。故选C。
16．It’s kind ________ you to help me learn English.
A．of B．for C．about D．with
【答案】A
【详解】句意：你帮我学英语真是太好了。
考查it固定句型。分析句子“It’s kind…you to help me learn English.”可知，该句是：It’s+adj.+of sb to do sth“某人做某事真是……的”，形容词kind“好心的”描述人的品质，需用介词of。故选A。
17．It would be fun ________ with children. We can feel happier with them.
A．playing B．played C．to play D．plays
【答案】C
【详解】句意：和孩子们一起玩会很有趣。和他们在一起我们会感到更快乐。
考查非谓语动词。“It is/would be+fun+to do sth.”意为“做某事是有趣的”，其中it是形式主语，不定式是真正的主语。因此空格处应填入to play。故选C。
18．Nowadays, AI technology ________ to improve traditional methods of learning, and it’s necessary for us ________ it.
A．has used; learning about B．is used; to learn about C．is using; to learn about
【答案】B
【详解】句意：如今，人工智能技术被用来改进传统的学习方法，我们有必要了解它。
考查被动语态和非谓语动词。“AI technology”与“use”之间是被动关系，表示人工智能技术被使用，所以第一空用一般现在时的被动语态“is used”；it is necessary for sb. to do sth.表示“对某人来说做某事是必要的”，固定句型，所以第二空用动词不定式“to learn about”。故选B。
19．Usually, ________ is difficult ________ a boy of five years old to dress himself.
A．that; for B．that; of C．it; for D．it; of
【答案】C
【详解】句意：通常，对于一个五岁的男孩来说，自己穿衣服是困难的。
考查it作形式主语以及介词辨析。that那个；it它；for对于；of……的。根据“... is difficult ... a boy of five years old to dress himself.”可知，此处使用it作形式主语，构成“it is+adj.+for sb. to do sth.”句型，表示“对于某人来说，做某事是……的”，所以第一空用it，第二空用for。故选C。
20．_______ is dangerous for us to swim in the river.
A．This B．That C．There D．It
【答案】D
【详解】句意：在河里游泳对我们来说是很危险的。
考查it的固定句型。This这；That那；There在那里；It它。英语中常用“it”作为形式主语，代替真正的主语（不定式短语），构成“It is+形容词+for sb. to do sth.”句型，表示“做某事对于某人来说是……的”。故选D。
21．It is not easy for my deskmate ________ negative feelings in her life.
A．deals with B．to deal with C．deal with D．dealing with
【答案】B
【详解】句意：对我的同桌来说，处理生活中的负面情绪并不容易。
考查不定式作主语。“It is+adj.+for sb.+to do sth.”表示“对某人来说做某事是……的”，此处应用动词不定式作主语，it是形式主语。故选B。
22．—It’s hard ________ students to get 100 in such a difficult exam, but you make it, Lucy!
—Actually, I should thank you. It’s so kind ________ you to help me with my study.
A．for; of B．for; for C．of; for D．of; of
【答案】A
【详解】句意：——对学生来说，在这么难的考试中得100分是很困难的，但你做到了，露西！——事实上，我应该谢谢你。你真是太好了，帮助我学习。
考查介词辨析。for为了，就……而言；of属于。第一空，形容词“hard”形容事情“to get 100”，表示“对学生来说，在这么难的考试中得100分是很困难的”，用for；第二空，形容词“kind”形容人“you”的品质，用of。故选A。
23．It’s clever ________ her ________ it easily.
A．of; to solve B．for; to solve C．of; solving D．for; solving
【答案】A
【详解】句意：她很聪明，轻松地解决了这个问题。
考查固定句型。of属于……的；for对于。“It is+形容词+for sb.+to do sth.”的句型中形容词描述事物的特性；“It is+形容词+of sb.+to do sth.”句型中形容词用于评价某人的性格或品质，如clever, kind, nice等。此处“clever”描述的是“her”的特质，因此用“of”；根据句型，此处应用动词不定式作真正主语。故选A。
24．Don’t speak loudly. It’s polite ________ your voice down in public.
A．keep B．to keep C．keeping
【答案】B
【详解】句意：不要大声说话。在公共场合把声音放低是礼貌的。
考查非谓语动词。“It’s+adj.+ to do sth.”是固定句型，表示“做某事是……的”，空处应是动词不定式。故选B。
25．It is kind________ you to________.
A．of; pick me up B．for; pick up me C．of; pick up me
【答案】A
【详解】句意：你真好，来接我。
考查固定句型和动词短语。“It is+形容词+for/of sb. to do sth.”意为“某人是……的去做某事”，句型中的形容词修饰人；句中“kind”描述人的品质，需用介词of；pick sb. up“接某人”。故选A。
26．—It is convenient ________ us ________ things online.
—So it is.
A．for; to buy B．of; to buy C．for; buy D．of; bought
【答案】A
【详解】句意：——对我们来说在网上买东西很方便。——确实如此。
考查介词和it固定句型。 for对于；of属于。根据“It is convenient ... us ... things online.”可知，此处考查句型“It is + 形容词 + for sb. to do sth.”，意为“对某人来说做某事是……”，“It is + 形容词 + of sb. to do sth.”，意为“某人做某事是……”，此处指网上买东西这件事是方便的，所以第一空填for，第二空填to buy。故选A。
27．It is easy ________ us ________ some useful information on the Internet.
A．of; to get B．of; get C．for; to get D．for; get
【答案】C
【详解】句意：对我们来说在互联网上得到一些有用的信息是很容易的。
考查it的固定句型。it is adj. for sb. to do sth.“对某人来说做某事是……的”，此处形容词是修饰所做的事；it is adj. of sb. to do sth.“对某人来说做某事是……的”，此处形容词是形容人的。根据“It is easy...us...some useful information on the Internet”可知此处指在互联网上得到有用的信息很容易，故用结构it is adj. for sb. to do sth.，it作形式主语，真正的主语是动词不定式。故选C。
28．—I left my math book at home this morning. Bill shared his ________ me.
—It’s necessary ________ students to help each other.
A．with; of B．to; for C．with; for
【答案】C
【详解】句意：——我今天早上把数学书忘在家里了。比尔和我分享了他的书。——学生互相帮助是必要的。
考查介词辨析。with和；of……的；for为了。第一个空，根据“Bill shared his”可知，此处指比尔和我分享了数学书，share sth with sb“与某人分享某物”，第一个空填with；第二个空，此句为“It’s+necessary+for sb. to do sth.”结构，含义是“对某人来说做某事是必要的”，第二个空填for。故选C。
29．It is dishonest __________ you __________ when you make mistakes.
A．for; to tell lies B．of; to tell lies C．for; telling lies D．of; telling lies
【答案】B
【详解】句意：当你犯错时撒谎是不诚实的。
考查It固定句型。for为了；of……的；to tell lies撒谎，动词不定式短语；telling lies撒谎，动名词短语。“dishonest”为形容人品质的形容词，分析句子结构可知，此句为“It is+形容词+of sb.+to do sth.某人做某事是……的”结构。第一个空填of；第二个空用动词不定式作真正的主语。故选B。
30．It’s nice ________ you all.
A．meet B．meets C．to meet D．meeting
【答案】C
【详解】句意：很高兴见到大家。
考查非谓语动词。It’s+形容词+to do sth.意为“做某事是……的”，为固定句式，不定式作真正的主语。故选C。
31．It’s silly ________ you ________ others for their faults.
A．for, not forgive B．of, not forgive C．for, not to forgive D．of, not to forgive
【答案】D
【详解】句意：你不原谅别人的过错是很愚蠢的。
考查it句型。It’s+adj.+of sb.+to do sth.用于描述人的品格或性格，其中形容词是用来评价人的；而It’s+adj.+for sb.+to do sth.则是描述事物性质。本句中silly是形容人的品质，因此第一空用of；第二空需要用动词不定式的否定形式not to forgive，构成完整句型。故选D。
32．It’s difficult for us ________ the difference between the two similar words.
A．understand B．to understand C．understanding D．understood
【答案】B
【详解】句意：对我们来说，理解这两个相似词之间的区别是困难的。
考查动词不定式。在句子“It’s difficult for us … the difference...”中，“it”是形式主语，真正的主语是动词不定式短语。故选B。
33．Next to my dad ________ my grandparents. It’s really kind ________ them to help people in need.
A．is, of B．is, for C．are, of
【答案】C
【详解】句意：我爸爸旁边是我的祖父母。他们真是太好了，帮助有需要的人。
考查主谓一致和介词辨析。of……的；for为了。第一个句子是倒装句，主语是my grandparents，be动词用are；根据“It’s really kind...them to help people in need”可知此处形容词kind是形容人的，故用结构it’s adj. of sb. to do sth.“某人做某事是……的”。故选C。
34．To improve your English, it’s important to ________ every chance to practice.
A．makes use of B．make use of C．making use of D．made use of
【答案】B
【详解】句意：为了提高你的英语水平，利用一切机会练习是很重要的。
考查it的固定句型。it’s important to do sth.“做某事是重要的”，为固定句型，不定式符号to后接动词原形，空处应是make use of。故选B。
35．________ necessary to protect endangered animals.
A．It’s B．That’s C．There’s D．What’s
【答案】A
【详解】句意：保护濒危动物是必要的。
考查it固定句型。It’s它是；That’s那是；There’s有；What’s什么是。分析句子可知，该句考查it固定句型“It’s adj to do sth”，it作形式主语，真正的主语是不定式。故选A。
36．It’s polite ________ “Excuse me” when you want to pass by someone.
A．say B．to say C．saying D．said
【答案】B
【详解】句意：当你想从别人身边经过时，说“Excuse me”是有礼貌的。
考查动词不定式作主语的用法。根据“It’s polite…”可知，“It’s polite to do sth.”固定句型，表示“做某事是有礼貌的”，此处需用动词不定式作真正主语。故选B。
37．It’s dangerous _________ on the thin ice.
A．skate B．skating C．to skate D．skates
【答案】C
【详解】句意：在薄冰上滑冰很危险。
考查非谓语形式。根据“It’s dangerous ... on the thin ice.”可知，考查固定句型“It is + 形容词 + to do sth.“，表示“做某事怎么样”；it作形式主语，to do不定式作真正的主语，所以此处用to skate。故选C。
38．________ great fun _________ so much about the world around us.
A．We are, to learn B．It’s, to learn C．We are, learning D．It’s, learning
【答案】B
【详解】句意：了解我们周围的世界是非常有趣的。
考查it固定句型。分析句子可知，此处句子结构为：It is + 形容词/名词 + to do sth，意为“做某事是……的”。故选B。
39．It’s not easy for each of the students ________ a healthy diet. Parents should help them with it.
A．have B．having C．has D．to have
【答案】D
【详解】句意：对每个学生来说，拥有健康的饮食并不容易。父母应该在这方面帮助他们。
考查非谓语动词。此处是结构it is adj. for sb. to do sth.“做某事对某人来说是……的”，it作形式主语，真正的主语是动词不定式。故选D。
40．It’s useful for us ________ different kinds of books. We have lots of fun ________.
A．to read; to read B．reading; reading C．to read; reading D．reading; to read
【答案】C
【详解】句意：对我们来说读不同种类的书是有用的。我们在阅读中获得很多乐趣。
考查it句型及非谓语动词。to read动词不定式；reading现在分词。“It’s+形容词+for sb. to do sth.“对某人来说做某事是……的”，为固定表达；have fun doing sth.“做某事很开心”，为固定用法。故选C。
二、选词填空（每小题1分，共10分）
选 (of,或for)完成句子
41．It’s too expensive me to buy the computer.
42．It’s difficult me to learn Japanese.
43．It’s kind you to say so.
44．It’s impossible Tom to get home on time.
45．It is too easy him to solve the problem.
46．It’s clever her to work out the problem in 2 minutes.
47．It is too late the students to apologize.
48．It is careless you to make so many mistakes.
49．It is necessary us not to read in the dark.
50. It’s brave ______ her to speak in public.
【答案】41．for 42．for 43．of 44．for 45．for 46．of 47．for 48．of 49．for 50. of
【解析】41．句意：这台电脑对我来说太贵了。expensive“贵的”，是修饰“to buy the computer”的，此处符合固定句型“it is adj for sb to do sth”，故填for。
42．句意：对我来说学日语很难。difficult“难的”，是修饰“to learn Japanese”的，此处符合固定句型“it is adj for sb to do sth”，填故填for。
43．句意：你这么说真是太好了。kind“好的”，是修饰“you”的，此处符合固定句型“it is adj of sb to do sth”，故填of。
44．句意：汤姆不可能准时到家。impossible“不可能的”，是修饰“to get home”的，此处符合固定句型“it is adj for sb to do sth”，故填for。
45．句意：解决这个问题对他来说太容易了。easy“容易的”，是修饰“to solve the problem”的。此处符合固定句型“it is adj for sb to do sth”，故填for。
46．句意：她真聪明，在两分钟内就做出了这道题。clever“聪明的”，修饰“her”，此处符合固定句型“it is adj of sb to do sth”，故填of。
47．句意：学生们道歉已经太晚了。late“迟的”，修饰“to apologize”，此处符合固定句型“it is adj for sb to do sth”，故填for。
48．句意：你犯了这么多错误，真是粗心。careless“粗心的”，修饰“you”，此处符合固定句型“it is adj of sb to do sth”，故填of。
49．句意：我们有必要不在黑暗中读书。you“必要的”，修饰“to read in the dark”，此处符合固定句型“it is adj for sb to do sth”，故填for。
50. 句意：她敢当众讲话真勇敢，brave勇敢的，形容人的品质。此处符合固定句型“it is adj of sb to do sth”，故填of。
三、完成句子（每小题2分，共10分）
51．医生认真倾听患者很重要。
important doctors carefully to patients.
【答案】 It’s for to listen
【详解】对比中英文可知，空格处缺少“倾听”，句子考查“It’s + adj. + for sb. to do sth.”这个固定句型；“It”作形式主语，真正的主语是不定式短语“to listen carefully to patients”。故填It’s；for；to；listen。
52．Eating too much junk food is unhealthy for teenagers. (改为同义句)
unhealthy for teenagers eat too much junk food.
【答案】 It’s to
【详解】句意：吃太多垃圾食品对青少年来说是不健康的。分析句子可知，该句是：It’s+adj+for sb+to do sth“对于某人来说，做某事是……的”，固定句型，即第一空应填入It’s，第二空应填to，与空格后“eat too much junk food”一同作真正的主语。故填It’s；to。
53．The boy is very clever. He can work out difficult problems. （合并为一句）
It is very clever the boy work out difficult problems.
【答案】 of to
【详解】句意：这个男孩很聪明。他能算出难题。根据题干可知考查句式It is+形容词+of sb.+to do sth.“对某人来说做某事怎么样”；clever“聪明的”是表示人物品格的，与介词of连用。故填of；to。
54．She gave me a bottle of water. She was very nice. (合并为一句)
It was very nice to give me a bottle of water.
【答案】 of her
【详解】句意：她给我一瓶水。她真的很好。此处要求合并为一句话，可以用it作形式主语，固定句式：It is+形容词+of sb. to do sth.，表示“做某事某人是……的”，of介词，后接人称代词宾格her。故填of；her。
55．Tom is smart. He always learns new things fast. (合并为一句)
It’s smart Tom new things fast.
【答案】 of to learn
【详解】句意：汤姆很聪明，他总是很快学会新东西。根据“Tom is smart.”可知此处描述人的性格品质，应用It is adj. of sb. to do sth.固定句型，意为“某人做某事真是太……了”，第一个空应填of；第二个空应填动词不定式to learn，表示“学会新东西”。故填of；to ；learn。
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