Unit 3 Discovering Useful Structures (ppt课件)-2022新人教版（2019）《高中英语》选择性必修第一册.pptx

1、UNIT 3语法精讲Entrepreneurial activities differ substantially depending on the type of organization and creativity.Entrepreneurial activities differ substantially depending on the type of organization and creativity.动词-ing形式作主语Have you ever seen these signs?the the ing ing formform1.Even though the sun

2、is brightly shining,_(tell)whether it is morning or night is impossible.(教材P26)2._(get)here is quite difficult,so apart from the Sami very few people have ever seen Sarek.(教材P26)tellingGetting3.For hundreds of years,_(look)after reindeer was a way of life for the Sami.(教材P26)4._(be)in such a beautif

3、ul and wild place makes me feel blessed to be alive.(教材P27)Beinglooking1.I wake up to the sound of the wind buffeting the cloth of my tent.(attribute)2.Even though the sun is brightly shining,telling whether it is morning or night is impossible.(subject)3.Checking my watch,I see that it is 7:30 a.m.

4、(adverbial)4.Getting here is quite difficult,so apart from the Sami very few people have ever seen Sarek.(subject)5.For hundreds of years,looking after reindeer was a way of life for the Sami.(subject)6.Being in such a beautiful and wild place makes me feel blessed to be alive.(subject)一、形式主动语态主动语态被

5、动语态被动语态一般式一般式完成式完成式doingbeing donehaving donehaving been done二、用法二、用法1、动词动词-ing形式作主语，表示一般或抽象的习惯形式作主语，表示一般或抽象的习惯性行为，谓语动词用单数性行为，谓语动词用单数。eg：Reading aloud is a good way to learn a language.大声朗读是学习语言的一种好方法。Not wearing glasses will make your eyesight worse.不戴眼镜会使你的视力变得更差。2.有时为了句子平衡，避免头重脚轻,用it作形式主语，而把真正的主语

6、(动词-ing短语)后置。常见的固定句型有：2 2、用、用itit作形式主语作形式主语,把动词把动词-ing-ing形式后置形式后置,常用在下面句式中。常用在下面句式中。(1)It is a waste of time doing sth.做某事浪费时间(2)It is useless/worthwhile doing sth.做某事没用/值得(3)It is no good/no use/no fun doing sth.做某事没好处/没用/没意义(4)It is no pleasure doing sth.做某事没有乐趣2.有时为了句子平衡，避免头重脚轻,用it作形式主语，而把真正的主语(

7、动词-ing短语)后置。常见的固定句型有：3 3、在在there be 结构中作主语：结构中作主语：There beThere benono动词动词ingingeg：There is no joking about such matters.这种事开不得玩笑。There is no saying when it will stop raining.无法断定这场雨什么时候会停。2.有时为了句子平衡，避免头重脚轻,用it作形式主语，而把真正的主语(动词-ing短语)后置。常见的固定句型有：4 4、动词动词-ing形式的复合结构作主语形式的复合结构作主语动词-ing形式的复合结构有两种形式：形容词性

8、物主代词+V-ing名词所有格+V-ingeg:Her coming to help encouraged all of us.她来帮忙鼓舞了我们所有人。His being late again made his teacher very angry.他再次迟到让老师很生气。动词-ing作主语，常常表示抽象的习惯性或经常性的动作。而不定式一般表示一次性、具体性的行为;且表示将来的事情或未达成的目的。To look after children is her job today.她今天的工作是看孩子。Looking after children is her work.她的工作是看孩子。三、三、

9、V V-ing与动词不定式作主语的与动词不定式作主语的区别区别：表示经常性或习惯性的动作且常放句首形容词性物主代词+动词-ing名词所有格+动词-ing动词-ing作 主 语动词-ing的复合结构Its a waste time doing sthIts useless/no use/no good doing sthIts no fun doing sthit 作形式主语动词原形+-ing基本构成基本用法动词-ing与动词不定式作主语的区别即时演练即时演练单句语法填空单句语法填空(1)_(learn)a musical instrument introduces a child to an

10、understanding of music.(2)Be careful！_(play)with fire near the wood will be very dangerous.(3)_(punish)made the student lose interest in his studies.(4)In my opinion,swimming _(be)a good sport in summer.LearningPlayingBeing punishedis 1._(bite)by snakes can be vital to people.2._(see)different famil

11、ies having fun together in nature in spring is a common thing.3._(invite)to the evening party is a great honor for me.4.Its an honor for me_(invite)to the party.Being bittenSeeingBeing invitedto be invited5、It is a waste of time _(try)to persuade him to give up playing computer games.trying6、_ his h

12、omework made the teacher angry.未完成他的作业让老师很生气。Not fininshing7、_(学习英语)is important in our modern society.Learning English8、It is a waste of time _(玩电脑游戏).playing computer games10、Going to Hangzhou by train _（take）about 16 hours.乘火车去杭州要16个小时。takes11、_（ask）a womans age _ impolite in our country.在我们国家问一个女人的年龄是不礼貌的。Askingis9、_(玛丽迟到)for class made the teacher angry.Marys being lateTHANK YOU!Entrepreneurial activities differ substantially depending on the type of organization and creativity.l activities differ substantially depending on the type of organization and creativity.