1.原形不定词是无to的不定词,即原形动词。
主语部分有一个表示动作的动词do时,作主语补语的不定词通常多用原形不定词。
All that we do every day is study.我们每天做的只是研读。
2.would ratherthan后都要求原形不定词。
I would rather study here than go to the movies.
我宁愿在这里学习也不愿去看电影。
3.had better后要求接原形不定词。
We had better finish our homework today.
我们最好今天作完我们的作业。
4.hope, expect, want等动词,表示请求、想要、打算做某事时,后接不定词。
I expect to take a picnic soon.
我期待着尽早去郊游。
5.原形不定词用在助动词后。
You should read the rules carefully first.
你们应该先仔细阅读这些规则。
6.for+名词或代名词的宾格+不定词,在此结构中for及其宾语构成的片语,实际上是不定词所表示的动作的逻辑主语,在句中可充当主语、宾语、补语及修饰语 。
Swimming is not difficult for me to learn.
游泳对我来说不难学。
7.原形不定词用在使役动词let,make, help,have后作宾语补语。
He made me laugh.
他逗我发笑。
8.原形不定词用在使役动词let,make,help,have的被动语态中,要用带to的不定词作主语补语。
We were made to laugh.
我们被逗笑了。
9.形容词+enough+不定词(足可)
The river is not deep enough to swim in.
这条河不够深,不能游泳。
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