初中动词不定式课件
33页1、动词不定式 (the infinitive),即to do ,其否定形式是not to do;不定式没有人称和数的变化。,动词不定式:,一.不定式的句法功能,1.Its normal to cry when we feel sad.,(做主语),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 well is not easy. = Its not easy to learn English well.,Its + adj. (+for sb.) +to do sth.,1. 不定式做主语:,常用句型:Its + adj. (+for sb.) + to do sth. (对某人来说)做某事是怎样的,=To work out the problem is difficult for me.,Its difficult for me to work out the problem.,=Working out the problem is difficul
2、t for me.,e.g. 对我来说解答出这道题是很难的。,2. The best way to learn English is to read loudly.,(做表语),可与be动词构成系表结构.,Her wish is to study in Ji Yan Middle school. My job is to clean the streets.,在形式上,位于系动词后的就是表语。从含义上讲,表语是回答主语“是什么” 的语法成分。,2. 不定式做表语:,常放在be动词后,表明主语“是什么”。 e.g. Our plan is to go there by plane. 我们的计划是乘飞机去那儿。 (主语和表语指代的是同一事物),1.My job is _computers. to selling B. sell C. to sell 2. Her hobby is _ (play) football.,to play,= Her hobby is playing football.,3.I want to buy a ticket.,(做宾语),接动词不定式作宾语常见的几个
3、动词是want , plan , hope , decide , begin , start. need , wait ,would like .hate. refuse. wish . prefer , learn. try. like .agree ,fail. be able to do, do/try ones best to do 等.,e.g. They decided to try again.,The little boy wanted to get to school before 8 oclock.,3. 不定式做宾语:即动词+to do的结构中,这里的to do就是做宾语,1.My friends want _(book) some tickets to the movie for us. 2. My parents decide _ (give) me more money. 3. He plans _ (go) to Beijing for a holiday. 4. The boy hopes _ (pass) the English exam. 5. My
4、 little son is able _ (read) some words. 6. Ill try my best _ (help) you. 7. She would like _ (become) beautiful.,4.Kangkang helped us to learn English.,动词不定式作宾语补足语,常见的动词有 tell , ask , get, want , would like , wish , teach , help , order ,invite, get, allow, send, lead 等.常构成下面的句式: V + sb. + to do 其否定形式为: V +sb. not +to do,(做宾语补足语),She told me not to give the book to him.,I asked Paul to carry the box.,4. 不定式做宾语补足语:即动词+sb. +to do的结构中,这里的to do就是做宾语补足语,1.Dont ask Jim _(go) swimming with us, because
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