初中英语动词不定式的基本用法

1、动词不定式（the infinitive）的基本用法动词不定式 1. 基本构成：to+动词原形 ，其否定形式是“not/never to do / not do”. 2. 基本用法：不定式可以带宾语或状语构成不定式短语，没有人称和数的变化。一、不定式的句法功能1. 作主语 eg: its very common to raise money in canadian and american school. 不定式做主语时,常用代词it 来代替不定式结构, 这时 it 被称为形式主语,而作为句子真正主语的不定式则被后置，往往放v.和adj.之后。 e.g. to learn english we

2、ll is not easy. =its not easyto learn english well. 不定式的逻辑主语有时用“of/for + 名词或代词宾格”构成, 即： its + adj.+ for / of sb. + to do sth.跟踪练习1. its very nice of them _ (send) me the flowers.2. _ (become) a teacher is my dream.3. its very important to learn english well.(同义句转换) _ english well _very important.4.

3、its important _ chinese well. a.to learnb. learnc. learningd. learns2. 作表语 eg：the best way to raise money is to sell newspapers. 表语是用来表示主语的身份、状态和特征等，可与系动词构成系表结构。 eg：her wish is to study in ji yan middle school. my job is to clean the streets.跟踪练习1. my work is _ (clean) the room every day. 2. his dre

4、am is _ (be) a doctor.3. 作宾语 eg：the driver offered to help the patient. 有些动词后只能用不定式作宾语，表示命令、打算或希望等。常见的此类动词有：agree, ask, choose, decide, want, would like, fail, help, hope, plan等。跟踪练习1.my friends want _ (book) some tickets to the movie for us.2. my parents decide _ (give) me more money.3. he plans _

5、(go) to beijing for a holiday.4. the boy hopes _ (pass) the english exam.5. my little son is able _ (read) some words.6. ill try my best _ (help) you.7. she would like _ (become) beautiful.4. 作宾语补足语 eg：it allows people to get closer to them. the world wide fund for nature chose the panda to be its s

6、ymbol. 动词不定式作宾语补足语，常构成的句式为：v. + sb. /sth. + to do。此类常见的动词有：tell, ask, want, wish, teach, help, order, invite, get, allow, send, lead, encourage, advise, warn, bear, beg, cause, command, drive, elect, expect, forbid, force, hate, intend, leave(留下), like, mean, need, permit, persuade, prefer, remind,

7、train, trouble等36个动词。即： ask sb. to do sth. 让某人做某事； tell sb. to do sth. 告诉某人做某事； invite sb. to do sth. 邀请某人做某事； help sb. to do sth. 帮助某人做某事； want sb. to do sth. 想要某人做某事； allow sb. to do sth. 允许某人做某事；. eg：my friend invites me to come to his home. i asked paul to carry the box. 其否定形式为：v. + sb. / sth. n

8、ot /never + to do。即： tell sb. not to do sth.告诉某人不要做某事; ask sb. not to do sth. 让某人不要做某事； warn sb. not to do sth. 警告某人不要做某事； order sb. not to do sth. 命令某人不要做某事； eg：my teacher tells us not to make too much noise. 跟踪练习1. dont ask jim _ (go) swimming with us, because his mother wont allow him _ (do) so.2

9、. does you mother like you _ a doctor? a. being b. to be c. are d. become3. my teacher always tells me _ (study) hard.4. i dont want you _ (help) me.5. shed like me _ (join) them.6. i wish you _ (have) a good time.7. my best friends teachme _ (swim).8. her boyfriend often invites her _ (have) dinner

10、.9. my mother always gets my father _ (do) housework.10. i order you _ (wash) your hands. 在动词think, believe, know, find, understand, take等之后，作宾补的不定式多由 “ to be adj”构成。 eg: they find the chinese people to be happy and cheerful he believed the earth to be a globe 在某些短语后也可跟不定式作宾补。这类动词短语常见的有：wait for, ca

11、ll on, depend on, care for, long for等。 eg: the crocodile waited for the monkey to come down again the chairman called on mr. brown to speak i shouldnt care for that man to be my doctor 有些动词后接省去to的动词不定式作宾语补足语，即：动词不定式在使役动词（make，let， have）或感官动词（feel，listen to，hear， look at，see，watch，notice）之后作宾补时不定式需省去

12、to。句式为：v. + sb. / sth. + do ; 其否定形式为：v. + sb. / sth. + not /never do。 为了便于记忆，我们可以这样记：“一感”（feel）“二听”（listen， hear）“三让”（let，make，have）“四看”（look at，see，watch，notice） eg：his words makes everyone laugh. his mother let him not watch tv. i felt someone open my door please listen to me sing the song again 注

13、意：感官动词后既可跟省略to的不定式作宾补，也可跟现在分词作宾补。其区别是：前者强调动作的全过程或经常性；后者则强调动作在进行(片断)。试比较： i heard her sing我听见她唱了歌。 i heard her singing我听见她在唱歌。 个别动词，如: help既可以接带to的不定式，也可以接不带to的不定式作宾语补足语。 eg：she helps me (to) do my homework. 跟踪练习1. when they went into the park, they saw someone _ chinese kongfu . a.plays b. played c.

14、 to play d. playing2. mr. brown made his students _ the new words again. a.copying b. copy c. to copy d. copied3. please let the students _ down. a. sitting b. sat c. sit d.tosit4. - is wei fang good at singing? - yes, she is. we often hear her_ in her room. a. to sing b. sing c. sings d. singing5.

15、a strange noise made me _ (stop) my work.5. 作状语 eg: we are sorry to hear that. (作原因状语) lets stop to have a rest. (作目的状语) she didnt work hard enough to pass the exam. (作结果状语)跟踪练习1. she sells flowers _ make money. a. made b. make c. to make d. to be made2. the room is not big enough _. a. to live in b. to be lived in c. to live d. for living3. im sorry_ you. a.trouble b. trouble with c. to trouble d. trouble about4. he is too young