人教版（2019）选择性必修 第三册Unit 2 Healthy Lifestyle不定式做主语课件（共16张ppt）
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| 名称 | 人教版（2019）选择性必修 第三册Unit 2 Healthy Lifestyle不定式做主语课件（共16张ppt） |  | |
| 格式 | pptx | ||
| 文件大小 | 329.5KB | ||
| 资源类型 | 教案 | ||
| 版本资源 | 人教版（2019） | ||
| 科目 | 英语 | ||
| 更新时间 | 2024-03-06 09:41:11 | ||
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文档简介
(共16张PPT)
选择性必修三
Unit 2
Discovering useful structures
The infinitive of the verb used as the subject
动词不定式作主语
Healthy Lifestyle
Focus on
基本用法
不定式作主语
一、通常用法
二、*it作形式主语的用法
*it作形式主语时的三种情况
三、“疑问词+动词不定式”作主语
1. 不定式作主语通常位于句首，表示具体的、某一次的或将来的动作，谓语动词用单数。
To see is to believe.
To get up early is necessary.
To finish the building in a month is difficult.
一【含义】
不定式作主语通常表示一个将来的、具体的内容;
而动词-ing形式则表示一种经常性的、习惯的或抽象的概念。
To look after children is her job today.
她今天的工作是看孩子。
Looking after children is her work.
她的工作是照顾孩子。
不定式作主语和动词-ing形式作主语和动词的区别：
[巧学活用1]——单句语法填空
①________ (finish) reading the book will take you two hours.
②________ (pay) a visit to the Forbidden City is my dream.
③To improve people's lives and to speed up socialist construction _____ (be) two important tasks today.
④________ (stay) up too late is a bad habit for our health.
To finish
To pay
are
Staying
2. 当主语较长，谓语较短时，常用it作形式主语放在句首，而将真正的主语—不定式放到谓语的后面。
To work out the problem is not easy.
=It’s not easy to work out the problem.
To play with snow in winter is interesting .
=It is interesting to play with snow in winter.
To finish the building in a month is difficult.
=It is difficult to finish the building in a month.
考点：it 作形式主语常见的句型
1. It is+形容词+for/of sb +to do sth
E.g.
It is easy for me to learn how to drive.
It is clever of you to apply for the position.
一般规律：
若形容词 ”描述人的属性，特征”, 用of;
若形容词“描述事或物的特征”, 用for;
It is stupid _______them to quarrel about this question.
It is easy _______ me to learn how to drive.
It is impolite ______ him to say so.
It is important _______ us to express our opinions.
It is clever ______ him to leave that company.
Exercises
2、接名词作表语：It is +n.+ to do sth.
It must be great fun to fly to the moon in a spaceship.
乘宇宙飞船飞往月球一定很有趣。
It is a pity for you to miss such a wonderful film.
你错过了这么好的电影，真可惜。
3. it作形式主语时，还常用于
“It takes sb. some time/money to do sth.” 句型中。
It took me more than an hour to do my homework yesterday evening.
昨天晚上我做作业用了一个多小时。
It will take us a lot of money to buy that house.
买那套房子要花费我们很多钱。
做某事花费某人多长时间(钱)
[巧学活用2]——单句语法填空
①[2022·新高考卷Ⅰ应用文]It is my pleasure ________ (invite) you to our English show “Talk and Talk” which will be conducted at 6 a．m. this Friday.
②It is good manners for the young ________ (give) their seats to the old.
③It is my ambition ________ (make) sure that the disabled people have access to all public buildings.
④It is no use ________ (argue) with him, for he is so stubborn.
to invite
to give
to make
arguing
不定式作主语，有时根据表达的需要，可以在添加疑问代词或副词，
疑问代词：who，whom，what，which
疑问副词：when，where，how
whether
E.g.
How to break the bad habit is the question.
Where to go hasn't been discussed.
It has not been decided whether to fly to Paris.
3.”疑问词+to do”作主语
[巧学活用3]——单句语法填空
①How ________ (cure) this kind of illness is still unknown.
②Whether ________ (do) it or not has not been decided.
③How ________ (deal) with this case hasn't been known yet.
to cure
to do
to deal
I.Choose the best answer.
1、It’s our duty ______ the room every day.
A. to clean B. cleaned
C. clean D. cleans
2、It’s hard for us _______ English well.
A. learn B. learns C. to learn D. learning
3、It’s very nice ___ you to get me two tickets ____ the World Cup.
A. for, of B. of, for C. to, for D. of, to
1. It is very helpful for all of us ________(help) a good knowledge of history.
2. It’s necessary for you ________ (lock) the car when you do not use it.
3. Afraid of ___________ (bite) by snakes, the boy was afraid ________ (touch) them.
4. ________(get) there by bike will take us half an hour.
Pratice
to help
to lock
being bitten
to touch
To get
Ⅲ. Translation.
1. 早起是必要的。
2. 对我们来说，完成这项工作很困难。
3. 如何控制水污染是一个大问题。
4. 步行去那儿要花费我们很长时间。
It’s difficult for us to finish the work.
How to control the water pollution is a big problem.
It will take us a long time to walk there.
To get up early is necessary.
选择性必修三
Unit 2
Discovering useful structures
The infinitive of the verb used as the subject
动词不定式作主语
Healthy Lifestyle
Focus on
基本用法
不定式作主语
一、通常用法
二、*it作形式主语的用法
*it作形式主语时的三种情况
三、“疑问词+动词不定式”作主语
1. 不定式作主语通常位于句首，表示具体的、某一次的或将来的动作，谓语动词用单数。
To see is to believe.
To get up early is necessary.
To finish the building in a month is difficult.
一【含义】
不定式作主语通常表示一个将来的、具体的内容;
而动词-ing形式则表示一种经常性的、习惯的或抽象的概念。
To look after children is her job today.
她今天的工作是看孩子。
Looking after children is her work.
她的工作是照顾孩子。
不定式作主语和动词-ing形式作主语和动词的区别：
[巧学活用1]——单句语法填空
①________ (finish) reading the book will take you two hours.
②________ (pay) a visit to the Forbidden City is my dream.
③To improve people's lives and to speed up socialist construction _____ (be) two important tasks today.
④________ (stay) up too late is a bad habit for our health.
To finish
To pay
are
Staying
2. 当主语较长，谓语较短时，常用it作形式主语放在句首，而将真正的主语—不定式放到谓语的后面。
To work out the problem is not easy.
=It’s not easy to work out the problem.
To play with snow in winter is interesting .
=It is interesting to play with snow in winter.
To finish the building in a month is difficult.
=It is difficult to finish the building in a month.
考点：it 作形式主语常见的句型
1. It is+形容词+for/of sb +to do sth
E.g.
It is easy for me to learn how to drive.
It is clever of you to apply for the position.
一般规律：
若形容词 ”描述人的属性，特征”, 用of;
若形容词“描述事或物的特征”, 用for;
It is stupid _______them to quarrel about this question.
It is easy _______ me to learn how to drive.
It is impolite ______ him to say so.
It is important _______ us to express our opinions.
It is clever ______ him to leave that company.
Exercises
2、接名词作表语：It is +n.+ to do sth.
It must be great fun to fly to the moon in a spaceship.
乘宇宙飞船飞往月球一定很有趣。
It is a pity for you to miss such a wonderful film.
你错过了这么好的电影，真可惜。
3. it作形式主语时，还常用于
“It takes sb. some time/money to do sth.” 句型中。
It took me more than an hour to do my homework yesterday evening.
昨天晚上我做作业用了一个多小时。
It will take us a lot of money to buy that house.
买那套房子要花费我们很多钱。
做某事花费某人多长时间(钱)
[巧学活用2]——单句语法填空
①[2022·新高考卷Ⅰ应用文]It is my pleasure ________ (invite) you to our English show “Talk and Talk” which will be conducted at 6 a．m. this Friday.
②It is good manners for the young ________ (give) their seats to the old.
③It is my ambition ________ (make) sure that the disabled people have access to all public buildings.
④It is no use ________ (argue) with him, for he is so stubborn.
to invite
to give
to make
arguing
不定式作主语，有时根据表达的需要，可以在添加疑问代词或副词，
疑问代词：who，whom，what，which
疑问副词：when，where，how
whether
E.g.
How to break the bad habit is the question.
Where to go hasn't been discussed.
It has not been decided whether to fly to Paris.
3.”疑问词+to do”作主语
[巧学活用3]——单句语法填空
①How ________ (cure) this kind of illness is still unknown.
②Whether ________ (do) it or not has not been decided.
③How ________ (deal) with this case hasn't been known yet.
to cure
to do
to deal
I.Choose the best answer.
1、It’s our duty ______ the room every day.
A. to clean B. cleaned
C. clean D. cleans
2、It’s hard for us _______ English well.
A. learn B. learns C. to learn D. learning
3、It’s very nice ___ you to get me two tickets ____ the World Cup.
A. for, of B. of, for C. to, for D. of, to
1. It is very helpful for all of us ________(help) a good knowledge of history.
2. It’s necessary for you ________ (lock) the car when you do not use it.
3. Afraid of ___________ (bite) by snakes, the boy was afraid ________ (touch) them.
4. ________(get) there by bike will take us half an hour.
Pratice
to help
to lock
being bitten
to touch
To get
Ⅲ. Translation.
1. 早起是必要的。
2. 对我们来说，完成这项工作很困难。
3. 如何控制水污染是一个大问题。
4. 步行去那儿要花费我们很长时间。
It’s difficult for us to finish the work.
How to control the water pollution is a big problem.
It will take us a long time to walk there.
To get up early is necessary.