初中英语语法三：动词不定式

1、英语主题：动词不定式，基本结构：to do否定：not to do没有人称和编号更改；不能在句子中使用谓词时态：表示将来要发生的行动的基本意思：语音上：通常表示主动(to be done)表目的last weekend I went to the library _ _ _ _ _ some books on how toTo get up early is a good habit。I should like to go with you。we have much work to do。he was too exited to say a word。to see is to believe。

2、在以动词不定式为主语的时候，代替不定式的it经常在句子的开头，动词不定式在谓语的后面，例如to get up early is a good habit。it is a good habit to get up early。(for us) to learn English well is easy。it is easy for us to learn English well。两个或多个不定式一起使用时，后面的不定式经常省略“to”。示例：I want you to stand beside me and hold the books。通常用不定式作为宾语的动词是：afford在fail同意

3、下拒绝refuse，选择choose decide确定learn学习expect，hope希望wish失败promise承诺pretend家长，练习3360以给定的适当形式填空。my mother has promised _ _ _ _ _ _ _ _ _ _ _(take)me to the park this weekend . 2 . I cant afford _ _ _ _ _ _ _ _ _ _ _ _ _had better，would rather后面的动词不定式“to”，如you had better do it right now . youd better not go

4、 there with them .表示情感的动词see(塞)、feel(费)、watch(瓦)、hear(赫)等，以及表示“使役”的动词(如make、let、have等)、动词help后的动词不定式可以带来to，to : dont let the children play with fire .wewatched him drive off。也可以不包括food，sleep and exercise help children(to)grow。一些动词(如、want、like、wish、hope、try、ask、start、learn、agree、teach、decide、understa

5、nd等)连接到例如：no one could tell me where to get the book。没有人能告诉我在哪里能找到这本书。Show us what to do。告诉我该做什么。I dont know whether to answer his letter。不知道是否回复他。These two dress are both beautful。I dont know which to choose .这两条裙子都很漂亮。我不知道该选择哪一个。不定式复合结构： for sb。to do sth。of sb。to do sth。例如：Its very kind of you to

6、help us。非常感谢你帮助我们。I think it necessary for us to study English hard。我认为我们努力学习英语是必要的。区分：for后的形容词是sth，指修正不定式后的形容词，这种形容词有important，neceary，difficult，easy等；Of后面的形容词是主语sb，形容词是kind，nice，polite，clever等练习。the lesson is not easy _ _ _ _ _ _ _ them to read。it was silly _ _ _ _ _ _ _ _ you to trust such a man。

7、有些动词可以做动词的原形和V-ing形式，或停在to do: stop to do sth手里等事情。stop doing sth。the students stopped taling when the teacher came in。if you f Eel tired，you may stop to have a rest。go on to do sth。一件事，继续做，go on doing sth。继续做(继续做同样的事情)忘记做某事(动作还没有发生)忘记做某事(动作已经发生)dont forget to lock the door when you lea Ve .I forgot

8、 telling him the story。我忘了已经告诉他那个了。Remember to do sth记得做什么(动作还没发生)remember doing sth。记住做了什么(动作已经发生)，Try to do sth尽量努力做某事。try to finish all the homework before dinner time-I usually go there by train-why not try going by boat for a change？我通常坐火车去那里。-为什么不换船？See/find/watch/heartsb.dosh .看到/报告/听到某人做了什么(整个表过程，或重复)see/find/watch/heartsb . doingsth .查看I often see her read books in the library .I saw her reading books in the li