新人教八年级下册英语动词不定式详细讲解.pptx

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1、知识回顾比较下列两组句子第一组:Every morning I keep on running.He likes playing tennis after school.第二组:My friends want me to go out with him.Jack invites me to go shopping.第1页/共20页不定式定义及构成(一)动词不定式定义:动词不定式是指动词的一种不带词形变化从而不指示人称、数量、时态的形式，属于非谓语形式。(二)动词不定式构成：to+动词原形 省“to”的不定式第2页/共20页to+动词原形A:I want to buy some books.B:

2、They wanted to buy some books.C:He decides to go home by himself.第3页/共20页动词后省to的不定式(一)感官动词：see,watch,notice,look at，hear,listen to,feel.A:He saw some birds fall into the river.B:I often hear the girl sing in the next room.C:They looked at that person go into the store.第4页/共20页动词后省to的不定式(二)使役动词:make,

3、let,have.A:My mother makes me go to school.B:Let the boy go.第5页/共20页动词后可省可不省“to”的不定式(三)特殊动词HelpA:I often help my mother do house work.B:My classmates help me to learn English.第6页/共20页不定式的否定形式1.带to的动词不定式的否定I want you to go now.I want you not to go now.直接在“to”前加not2.省to的动词不定式的否定Let the boy go out.Let

4、the boy not go out.直接在动词前加not第7页/共20页动词不定式用法 动词不定式放在一些动词后面可以作宾语、宾语补足语、目的状语、表语等。第8页/共20页 动词不定式用法 (一)动词不定式作宾语 动词不定式可以放在一些动词后用作宾语，动词不定式作宾语的常用动词有:begin ask,want,forget,remember,learn,hate 等。A：I want to go home now.B:She forgets to take some medicine.C:My mother learns to dance.第9页/共20页不定式作宾语结构Want to do

5、 sth Need to do sthDecide to do sthLearn to do sthWish to do sth Try to do sthHope to do sthPlan to do sth 第10页/共20页练习A:我想买一些书。I want to buy some books.B:他们需要做更多的运动。They need to do more exercise.C:他希望离开学校。He hopes to leave school.第11页/共20页动词不定式用法(二)动词不定式作宾语补足语。动词不定式作宾语补足语表示宾语所做的动作，可以用动词作宾语补足语的动词有：te

6、ll,ask,want,invite,expect,help等。第12页/共20页A:I want you to go now.B:Her parents wish her to be a teacher.C:He invites me to go swimming.第13页/共20页动词不定式作宾补结构Ask sb to do sthInvite sb to do sthTell sb to do sthExpect sb to do sthWant sb to do sthWish sb to do sth Advise sb to do sth第14页/共20页根据汉语完成句子:我们需要

7、想出一个好计划 We need _ _ _ _ a plan.我们每人打电话给10个人,请他们来.We each _ _ ten people and ask them_ _.他们总是自愿贡献他们的时间来帮助他人.They always_ their time _ _ other people.他咳嗽的厉害,他的医生让他戒烟.He has a terrible cough.His doctor asked him _ _ _ smoking.第15页/共20页动词不定式的用法(三)动词不定式作目的状语。动词不定式作目的状语常用在go,come,hurry等不及物动词后，表目的。A:He wen

8、t to see his sister yesterday.B:She goes to England to learn English.第16页/共20页The girl could visit the sick kids in the hospital to cheer them up.She stills there once a week to help kids learn to read.She went home to have breakfast.I make a lot of money to help the sick kids.I study hard to get good grades.第17页/共20页结语动词不定式定义动词不定式结构 带to的结构 省to的结构动词不定式的用法 作宾语 作宾补 作目的状语第18页/共20页第19页/共20页谢谢您的观看！第20页/共20页