Unit 8 Knowing the world it的用法（单元核心语法精练) 英语冀教版2024七年级上册

Unit 8 Knowing the world 核心语法精练（it的用法） 目录 A.考点概览·知识回顾 1 B.考点夯基·专项突破 2 一、用所给单词的正确形式填空。 2 二、单项选择 2 C．综合攻坚·能力跃升 3 题型一 语法选择 5 题型二 语法填空 7 it的用法 （1）it在句中可以指人、物、时间、天气、距离等。 -Is this your pen? -Yes, it is. it指物 -What is it? -It’s a baby. it指婴儿 -Who is that? -It’s me. It一般指不明身份的人 It is 7:00 now. it指时间 It is April 10 today. it指日期 It is three dollars. it指价格 It’s snowing heavily. it指天气 It is 5 kilometres from my home to school. it指距离 （2）It用于某些句型 It’s time for sth. 该做某事了。 例句：It’s time for lunch.该吃午饭了 It’s time to do sth. 该做某事的时候了。 例句：It’s time to go to school. 到上学时间了 It’s time for sb to do sth. 某人该干某事了。 例句：It’s time for you to go to school. 到你上学时间了。 (3)it用作形式主语 ⑴. 基本用法 当不定式、动名词、从句等复杂成分用作句子主语时，为保持句子平衡，通常把真正的主语放在句末，而在句首使用形式主语it。如： It’s very important to remember this. 记住这一点很重要。 It’s hard work climbing mountains. 爬山是费劲的事。 It’s unknown when he will come. 他什么时候来还不知道。 ⑵. 用作形式主语的的重要句型 ① It + be + adj. for (of) sb to do sth 某人做某事…… It is hard for him to make up his mind. 他很难下定决心 ②.It takes sb + 时间段 + to do sth. 某人做某事花了……时间 It takes years to master a new language. 要花多年的时间才能掌握一门新的语言。 (4)it用作形式宾语 基本结构为“动词+it+宾语补足语+不定式(动名词或从句)” 这类动词如：Find ,think ,feel, imagine, believe, consider如： I find it difficult to do the job well. 我发现做好这件事不容易。 一、用所给单词的正确形式填空。 1. ____ is necessary that we should master a foreign language. 2. I find ____ hard to solve this problem. 3. ____ takes him half an hour to walk to school every day. 4. We think ____ important that we should protect the environment. 5. ____ is a pity that you can't come to the party. 6. She made ____ clear that she would support us. 7. ____ is said that he is a very hard - working student. 8. I consider ____ necessary to have a good rest after a long day's work. 9. ____ is no use crying over spilt milk. 10. He believes ____ a fact that hard work leads to success. 二、单项选择 1．—What’s your car number?—________ 665488. A．I’m B．I am C．It’s D．My car 2． ________ is far from Beijing to New York. A．It B．That C．This D．One 3．—What’s the time, Sophia?—________ 7:10 a.m. It’s time for us________to school. A．It’s; go B．This is; going C．Its; to go D．It’s; to go 4．—________ is that jacket? —________ $100. A．How much; They’re B．How much; It’s C．What color; It’s D．What; They’re 5．— Tina , what’s this?— ______ a key . A．That B．This C．It’s D．it’s 6．How far is ________ from your home ________ the library? A．it; to B．this; to C．that; in D．it; in 7．─When is Mary's birthday？ ─_________ on July 3rd. A．It B．Its C．They're D．It's 8． is sunny today! You’d better walk to school. A．That B．This C．It D．One 9．—What is the date today?—________ is January 1. A．This B．That C．It's D．It 10．—I’m planning to go to Sanya this Spring Festival. How’s the weather there?—Not so hot. Sometimes ________ is very cool. A．this B．that C．one D．it 11．________ is three hundred kilometres away from here to Baoding. A．This B．That C．There D．It 12．－What day is it today?－________ is Friday. A．Its B．Today C．It D．This 13．—I’m planning to go to Sanya this winter holiday. How’s the weather there?—Not so hot. Sometimes _________ is very cool. A．this B．that C．one D．it 14．—Look at the watch. ________ 7 o’clock now.—Let’s go to school. A．It B．They C．It’s D．They’re 15．________ is sunny. Let’s go mountain climbing. A．It B．That C．This D．They 16．—Who is knocking at the door? —_______is the milkman , I think . A．He B．It C．This D．That 17．—Who plays sports on the playground?—I am afraid ________ is our cousin Alan. A．he B．she C．it D．they 18．—Who's this in the picture?—Is _______ Tom? A．this B．that C．it D．he 19．—Is this your father?— ________ A．Yes, he is. B．No, this isn’t. C．No, it isn’t. D．Yes, it’s. 20．—Who ________ your English teacher, Tom?—________ Miss Green. A．is; It’s B．are; It’s C．is; He is D．are; Its 21．It’s time ________ basketball. A．play B．playing C．to play D．played 22．It’s time ________ an English lesson. A．for having B．for have C．to have D．to having 23．It’s 8:00. It’s time ________ class. A．to B．for C．with D．at 24．—What do you usually eat on the Chinese New Year’s Eve?—__________ is a tradition for my family to eat fish and tofu. A．This B．That C．It D．He 25．It takes me half an hour ________ to school every morning. And it is good for my health. A．walk B．to walk C．walking D．walked 26．________ is easy for me to make some strawberry (草莓) cakes. A．It B．You C．She D．We 27．It’s important for designers ______ user-friendly products. A．create B．creating C．to create D．created 28．You helped to make ________ possible for me to get the job. A．it B．this C．that D．these 29．We find ________ impossible for us ________ a foreign language well in a short time. A．it; to learn B．one; learn C．that; to learn D．it; learning 30．She finds ________ difficult to predict what will happen in the future. A．it B．that C．this D．its 题型一 语法选择 Hello, everyone! My name is Lily. Let me tell you something about my daily life. (1) ____ is 7:00 a.m. now. (2) ____'s time for me to get up. I think (3) ____ is important to have a good breakfast. My home is not far from school, so (4) ____ only takes me ten minutes to walk there. Look at the sky! (5) ____ is sunny today. In the afternoon, (6) ____ is fun to play basketball with my friends. After school, (7) ____'s my job to clean the classroom. My teacher often says, "(8) ____ is not easy to learn English well, but you can do (9) ____!" I think she is right. Now, (10) ____ is time to do my homework. 1. A. This B. That C. It D. He 2. A. This B. That C. It D. He 3. A. this B. that C. it D. he 4. A. this B. that C. it D. he 5. A. This B. That C. It D. He 6. A. this B. that C. it D. he 7. A. this B. that C. it D. he 8. A. This B. That C. It D. He 9. A. this B. that C. it D. he 10. A. this B. That C. It D. He 题型二 语法填空 用 “it” 的正确形式（It, it, it's, its）填空，完成下面的短文。注意大小写。 Hello! I'm Tom. Let me tell you about my day. (1) ______ is 6:30 a.m. now. (2) ______'s time to get up. I think (3) ______ is healthy to drink milk every morning. Look outside! (4) ______ is raining. So (5) ______ is not a good day for sports. My school is far from my home. (6) ______ takes me about one hour to get there by bus. My teacher says (7) ______ is important to listen carefully in class. After school, (8) ______ is fun to play chess with my friends. What's that? Is (9) ______ a bird over there? Oh no, (10) ______ is just a kite. 1 / 12 学科网（北京）股份有限公司 $ Unit 8 Knowing the world 核心语法精练（it的用法） 目录 A.考点概览·知识回顾 1 B.考点夯基·专项突破 2 一、用所给单词的正确形式填空。 2 二、单项选择 4 C．综合攻坚·能力跃升 10 题型一 语法选择 10 题型二 语法填空 11 it的用法 （1）it在句中可以指人、物、时间、天气、距离等。 -Is this your pen? -Yes, it is. it指物 -What is it? -It’s a baby. it指婴儿 -Who is that? -It’s me. It一般指不明身份的人 It is 7:00 now. it指时间 It is April 10 today. it指日期 It is three dollars. it指价格 It’s snowing heavily. it指天气 It is 5 kilometres from my home to school. it指距离 （2）It用于某些句型 It’s time for sth. 该做某事了。 例句：It’s time for lunch.该吃午饭了 It’s time to do sth. 该做某事的时候了。 例句：It’s time to go to school. 到上学时间了 It’s time for sb to do sth. 某人该干某事了。 例句：It’s time for you to go to school. 到你上学时间了。 (3)it用作形式主语 ⑴. 基本用法 当不定式、动名词、从句等复杂成分用作句子主语时，为保持句子平衡，通常把真正的主语放在句末，而在句首使用形式主语it。如： It’s very important to remember this. 记住这一点很重要。 It’s hard work climbing mountains. 爬山是费劲的事。 It’s unknown when he will come. 他什么时候来还不知道。 ⑵. 用作形式主语的的重要句型 ① It + be + adj. for (of) sb to do sth 某人做某事…… It is hard for him to make up his mind. 他很难下定决心 ②.It takes sb + 时间段 + to do sth. 某人做某事花了……时间 It takes years to master a new language. 要花多年的时间才能掌握一门新的语言。 (4)it用作形式宾语 基本结构为“动词+it+宾语补足语+不定式(动名词或从句)” 这类动词如：Find ,think ,feel, imagine, believe, consider如： I find it difficult to do the job well. 我发现做好这件事不容易。 一、用所给单词的正确形式填空。 1. ____ is necessary that we should master a foreign language. 2. I find ____ hard to solve this problem. 3. ____ takes him half an hour to walk to school every day. 4. We think ____ important that we should protect the environment. 5. ____ is a pity that you can't come to the party. 6. She made ____ clear that she would support us. 7. ____ is said that he is a very hard - working student. 8. I consider ____ necessary to have a good rest after a long day's work. 9. ____ is no use crying over spilt milk. 10. He believes ____ a fact that hard work leads to success. 【答案与解析】 1.It is necessary that we should master a foreign language. 解析：真正的主语是 "that we should master a foreign language" 这个从句。为了避免句子头重脚轻，用 It 作形式主语放在句首。句型为：It is + 形容词 + that 从句。 翻译：我们掌握一门外语是必要的。 2.I find it hard to solve this problem. 解析：动词 "find" 的真正宾语是 "to solve this problem" 这个不定式，"hard" 是宾语补足语。当宾语是不定式或从句且后面有补足语时，必须用 it 作形式宾语。句型为：主语 + 谓语 + it + 形容词/名词 + 真正宾语 (to do/that从句)。 翻译：我发现解决这个问题很难。 3.It takes him half an hour to walk to school every day. 解析：这是一个固定句型 "It takes sb. some time to do sth."。真正的主语是 "to walk to school every day"，所以句首用 It 作形式主语。 翻译：他每天步行上学要花半个小时。 4.We think it important that we should protect the environment. 解析：动词 "think" 的真正宾语是 "that we should protect the environment" 这个从句，"important" 是宾语补足语。所以需要用 it 作形式宾语。 翻译：我们认为保护环境很重要。 5.It is a pity that you can't come to the party. 解析：真正的主语是 "that you can't come to the party" 这个从句。用 It 作形式主语是表达个人评价的常见方式。句型为：It is + a + 名词 + that 从句。 翻译：你不能来参加聚会真可惜。 6.She made it clear that she would support us. 解析：动词 "made" 的真正宾语是 "that she would support us" 这个从句，"clear" 是宾语补足语。所以需要用 it 作形式宾语。 翻译：她明确表示她会支持我们。 7.It is said that he is a very hard-working student. 解析：这是一个固定句型 "It is said that..."（据说……）。真正的主语是 "that he is a very hard-working student" 这个从句。 翻译：据说他是个非常努力的学生。 8.I consider it necessary to have a good rest after a long day's work. 解析：动词 "consider" 的真正宾语是 "to have a good rest" 这个不定式，"necessary" 是宾语补足语。所以需要用 it 作形式宾语。 翻译：我认为在一天漫长的工作之后好好休息是必要的。 9.It is no use crying over spilt milk. 解析：真正的主语是动名词短语 "crying over spilt milk"。句型 "It is no use/good doing sth." 表示"做某事没有用"。 翻译：覆水难收。（为打翻的牛奶哭泣是没有用的。） 10.He believes it a fact that hard work leads to success. 解析：动词 "believes" 的真正宾语是 "that hard work leads to success" 这个从句，"a fact" 是宾语补足语（名词）。所以需要用 it 作形式宾语。 翻译：他相信努力工作能带来成功是一个事实。 二、单项选择 1．—What’s your car number?—________ 665488. A．I’m B．I am C．It’s D．My car 1.【答案】C 【详解】句意：—你的车牌号是多少？—是665488。考查代词和动词的用法。问句问的是车牌号，答句需用“It's + 号码”的结构来指代所问的事物，故选C。 2． ________ is far from Beijing to New York. A．It B．That C．This D．One 2.【答案】A 【详解】句意：从北京到纽约很远。考查固定句型。“It is + 形容词 + from...to...”是表示两地距离的固定句型，it作形式主语，故选A。 3．—What’s the time, Sophia?—________ 7:10 a.m. It’s time for us________to school. A．It’s; go B．This is; going C．Its; to go D．It’s; to go 3.【答案】D 【详解】句意：—索菲亚，几点了？—早上7:10。我们该去上学了。考查时间和固定句型。问时间用“What's the time?”，回答用“It's...”。“It's time for sb. to do sth.”是固定句型，意为“是某人做某事的时候了”，故选D。 4．—________ is that jacket? —________ $100. A．How much; They’re B．How much; It’s C．What color; It’s D．What; They’re 4.【答案】B 【详解】句意：—那件夹克多少钱？—100美元。考查疑问词和代词。根据答语“$100”可知是询问价格，用“How much”。问句主语“that jacket”是单数，答语需用“It's”指代，故选B。 5．— Tina , what’s this?— ______ a key . A．That B．This C．It’s D．it’s 5.【答案】C 【详解】句意：—蒂娜，这是什么？—它是一把钥匙。考查代词的用法。问句“What's this?”，答语用“It's...”来指代所问的事物，句首单词首字母需大写，故选C。 6．How far is ________ from your home ________ the library? A．it; to B．this; to C．that; in D．it; in 6.【答案】A 【详解】句意：从你家到图书馆有多远？考查固定句型。“How far is it from...to...?”是询问两地距离的固定句型，it作形式主语，故选A。 7．─When is Mary's birthday？ ─_________ on July 3rd. A．It B．Its C．They're D．It's 7.【答案】D 【详解】句意：—玛丽的生日是什么时候？—在7月3日。考查代词的用法。问日期，回答时需用“It's + 日期”的结构，It指代时间，故选D。 8． is sunny today! You’d better walk to school. A．That B．This C．It D．One 8.【答案】C 【详解】句意：今天天气晴朗！你最好步行去学校。考查代词的用法。此句中“It”用作非人称代词，指代天气，故选C。 9．—What is the date today?—________ is January 1. A．This B．That C．It's D．It 9.【答案】D 【详解】句意：—今天是几号？—是1月1日。考查代词的用法。问日期，回答时需用“It is + 日期”的结构，It指代时间，故选D。 10．—I’m planning to go to Sanya this Spring Festival. How’s the weather there?—Not so hot. Sometimes ________ is very cool. A．this B．that C．one D．it 10.【答案】D 【详解】句意：—我计划这个春节去三亚。那里的天气怎么样？—不太热。有时天气很凉爽。考查代词的用法。此句中“it”用作非人称代词，指代天气，故选D。 11．________ is three hundred kilometres away from here to Baoding. A．This B．That C．There D．It 11.【答案】D 【详解】句意：从这里到保定有三百公里远。考查固定句型。“It is + 距离 + away from...to...”是表示距离的固定句型，it作形式主语，故选D。 12．－What day is it today?－________ is Friday. A．Its B．Today C．It D．This 12.【答案】C 【详解】句意：—今天是星期几？—今天是星期五。考查代词的用法。问星期几，回答时需用“It is + 星期”的结构，It指代时间，故选C。 13．—I’m planning to go to Sanya this winter holiday. How’s the weather there?—Not so hot. Sometimes _________ is very cool. A．this B．that C．one D．it 13.【答案】D 【详解】句意：—我计划这个寒假去三亚。那里的天气怎么样？—不太热。有时天气很凉爽。考查代词的用法。此句中“it”用作非人称代词，指代天气，故选D。 14．—Look at the watch. ________ 7 o’clock now.—Let’s go to school. A．It B．They C．It’s D．They’re 14.【答案】C 【详解】句意：—看表。现在7点了。—我们去上学吧。考查时间和代词的用法。表示时间用“It's + 钟点”的结构，故选C。 15．________ is sunny. Let’s go mountain climbing. A．It B．That C．This D．They 15.【答案】A 【详解】句意：天气晴朗。我们去爬山吧。考查代词的用法。此句中“It”用作非人称代词，指代天气，故选A。 16．—Who is knocking at the door? —_______is the milkman , I think . A．He B．It C．This D．That 16.【答案】B 【详解】句意：—谁在敲门？—我想是送奶工。考查代词的用法。当不知道或看不清对方身份时，常用“it”来指代人，故选B。 17．—Who plays sports on the playground?—I am afraid ________ is our cousin Alan. A．he B．she C．it D．they 17.【答案】C 【详解】句意：—谁在操场上做运动？—恐怕是我们的表弟艾伦。考查代词的用法。当不确定或要确认某人身份时，常用“it”来指代人，故选C。 18．—Who's this in the picture?—Is _______ Tom? A．this B．that C．it D．he 18.【答案】C 【详解】句意：—照片里这个人是谁？—是汤姆吗？考查代词的用法。指代照片中或电话中身份不明的人时，常用“it”，故选C。 19．—Is this your father?— ________ A．Yes, he is. B．No, this isn’t. C．No, it isn’t. D．Yes, it’s. 19.【答案】C 【详解】句意：—这是你的父亲吗？—不，不是。考查一般疑问句的回答。问句“Is this...?”，答语中需用“it”来指代“this”，否定回答为“No, it isn't.”，故选C。 20．—Who ________ your English teacher, Tom?—________ Miss Green. A．is; It’s B．are; It’s C．is; He is D．are; Its 20.【答案】A 【详解】句意：—汤姆，谁是你的英语老师？—是格林小姐。考查主谓一致和代词。问句主语“Who”是单数概念，谓语动词用“is”。答语指代身份不明的人（英语老师）时，常用“It's”，故选A。 21．It’s time ________ basketball. A．play B．playing C．to play D．played 21.【答案】C 【详解】句意：是打篮球的时间了。考查固定句型。“It's time to do sth.”是固定句型，意为“是做某事的时候了”，故选C。 22．It’s time ________ an English lesson. A．for having B．for have C．to have D．to having 22.【答案】C 【详解】句意：是上英语课的时间了。考查固定句型。“It's time to do sth.”是固定句型，意为“是做某事的时候了”，故选C。 23．It’s 8:00. It’s time ________ class. A．to B．for C．with D．at 23.【答案】B 【详解】句意：八点了。是上课的时间了。考查固定句型。“It's time for + 名词”是固定句型，意为“是……的时候了”，故选B。 24．—What do you usually eat on the Chinese New Year’s Eve?—__________ is a tradition for my family to eat fish and tofu. A．This B．That C．It D．He 24.【答案】C 【详解】句意：—除夕夜你们通常吃什么？—吃鱼和豆腐是我家的一个传统。考查it作形式主语。句中真正的主语是“to eat fish and tofu”，用“it”作形式主语，故选C。 25．It takes me half an hour ________ to school every morning. And it is good for my health. A．walk B．to walk C．walking D．walked 25.【答案】B 【详解】句意：每天早晨步行去学校要花费我半个小时。这对我的健康有好处。考查固定句型。“It takes sb. some time to do sth.”是固定句型，意为“做某事花费某人多少时间”，故选B。 26．________ is easy for me to make some strawberry (草莓) cakes. A．It B．You C．She D．We 26.【答案】A 【详解】句意：对我来说，做一些草莓蛋糕很容易。考查it作形式主语。句中真正的主语是“to make some strawberry cakes”，用“it”作形式主语，故选A。 27．It’s important for designers ______ user-friendly products. A．create B．creating C．to create D．created 27.【答案】C 【详解】句意：对设计师来说，创造用户友好的产品很重要。考查固定句型。“It is + 形容词 + for sb. to do sth.”是固定句型，意为“对某人来说做某事是……的”，故选C。 28．You helped to make ________ possible for me to get the job. A．it B．this C．that D．these 28.【答案】A 【详解】句意：你帮助我使得到这份工作成为可能。考查it作形式宾语。动词“make”的真正宾语是“for me to get the job”，“possible”是宾语补足语，需用“it”作形式宾语，故选A。 29．We find ________ impossible for us ________ a foreign language well in a short time. A．it; to learn B．one; learn C．that; to learn D．it; learning 29.【答案】A 【详解】句意：我们发现对我们来说在短时间内学好一门外语是不可能的。考查it作形式宾语。动词“find”的真正宾语是“to learn a foreign language well in a short time”，“impossible”是宾语补足语，需用“it”作形式宾语，故选A。 30．She finds ________ difficult to predict what will happen in the future. A．it B．that C．this D．its 30.【答案】A 【详解】句意：她发现预测未来会发生什么很困难。考查it作形式宾语。动词“finds”的真正宾语是“to predict what will happen in the future”，“difficult”是宾语补足语，需用“it”作形式宾语，故选A 题型一 语法选择 Hello, everyone! My name is Lily. Let me tell you something about my daily life. (1) ____ is 7:00 a.m. now. (2) ____'s time for me to get up. I think (3) ____ is important to have a good breakfast. My home is not far from school, so (4) ____ only takes me ten minutes to walk there. Look at the sky! (5) ____ is sunny today. In the afternoon, (6) ____ is fun to play basketball with my friends. After school, (7) ____'s my job to clean the classroom. My teacher often says, "(8) ____ is not easy to learn English well, but you can do (9) ____!" I think she is right. Now, (10) ____ is time to do my homework. 1. A. This B. That C. It D. He 2. A. This B. That C. It D. He 3. A. this B. that C. it D. he 4. A. this B. that C. it D. he 5. A. This B. That C. It D. He 6. A. this B. that C. it D. he 7. A. this B. that C. it D. he 8. A. This B. That C. It D. He 9. A. this B. that C. it D. he 10. A. this B. That C. It D. He 【答案与解析】 1.C. It 详解：句意为“现在是早上7点”。表示时间，用固定句型 "It is + 钟点"。 2.C. It 详解：句意为“到我起床的时间了”。"It's time for sb. to do sth." 是固定句型，意为“是某人做某事的时候了”。 3.C. it 详解：句意为“我认为吃一顿好的早餐很重要”。动词 "think" 后面，真正的主语是 "to have a good breakfast"，这里用 it 作形式主语。句型为 "I think it is important to do sth."。 4.C. it 详解：句意为“所以步行到那里只花费我十分钟”。"It takes sb. some time to do sth." 是固定句型，it 作形式主语。 5.C. It 详解：句意为“今天天气晴朗”。表示天气，用 it 作非人称代词。 6．C. it 详解：句意为“下午和我的朋友打篮球很有趣”。真正的主语是 "to play basketball with my friends"，这里用 it 作形式主语。句型为 "It is fun to do sth."。 7．C. it 详解：句意为“打扫教室是我的职责”。真正的主语是 "to clean the classroom"（被省略或转化了），这里用 it 作形式主语。句型为 "It is one's job to do sth."。 8.C. It 详解：句意为“学好英语不容易”。真正的主语是 "to learn English well"，这里用 it 作形式主语。句型为 "It is not easy to do sth."。 9.C. it 详解：句意为“但你能做到！” 这里的 it 指代前文“学好英语”这件事。 10.C. It 详解：句意为“现在是做作业的时间了”。"It is time to do sth." 是固定句型，意为“是做某事的时候 题型二 语法填空 用 “it” 的正确形式（It, it, it's, its）填空，完成下面的短文。注意大小写。 Hello! I'm Tom. Let me tell you about my day. (1) ______ is 6:30 a.m. now. (2) ______'s time to get up. I think (3) ______ is healthy to drink milk every morning. Look outside! (4) ______ is raining. So (5) ______ is not a good day for sports. My school is far from my home. (6) ______ takes me about one hour to get there by bus. My teacher says (7) ______ is important to listen carefully in class. After school, (8) ______ is fun to play chess with my friends. What's that? Is (9) ______ a bird over there? Oh no, (10) ______ is just a kite. 【答案及解析】： 1. It 详解：句意为“现在是6:30”。表示时间，用固定句型 "It is + 钟点"。句首单词首字母大写。 2. It's 详解：句意为“到起床的时间了”。“It's time to do sth.” 是固定句型，意为“是做某事的时候了”。It's 是 It is 的缩写形式。 3. it 详解：句意为“我认为每天早晨喝牛奶是健康的”。动词 "think" 后面，真正的主语是 "to drink milk every morning"，这里用 it 作形式主语。句型为 "I think it is + 形容词 + to do sth."。 4. It 详解：句意为“外面正在下雨”。表示天气，用 It 作非人称代词。句首单词首字母大写。 5. it 详解：句意为“所以这不是一个运动的好天气”。这里 it 指代“今天这种天气情况”。 6. It 详解：句意为“乘坐公交车到那里要花费我大约一小时”。“It takes sb. some time to do sth.” 是固定句型，it 作形式主语。句首单词首字母大写。 7. it 详解：句意为“我的老师说在课堂上认真听讲是很重要的”。真正的主语是 "to listen carefully in class"，这里用 it 作形式主语。 8. it 详解：句意为“放学后和朋友下棋很有趣”。真正的主语是 "to play chess with my friends"，这里用 it 作形式主语。句型为 "It is fun to do sth."。 9. it 详解：句意为“那边那是一只鸟吗？”。当指代身份不明或远处的事物时，常用 "it" 来指代。 10. it 详解：句意为“哦不，它只是一个风筝”。这里的 it 指代上一句中提到的那个远处的事物（被误认为是鸟的风筝）。 1 / 12 学科网（北京）股份有限公司 $