省略to的动词不定式

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大家都知道在动词不定式to do中，“to”是不定式的标志，有了这个to，后面所跟的动词该用原形。

但是to也有可以省略的时候，这个时候虽然没有了to，后面所跟的动词依然用原形。

今天的每日一课就给大家总结一些省略to的动词不定式。

1、情态动词（除ought 外）后的to已省略。

例：You must go to the hospital first. 你必须先去医院。

I can swim well. 我能游得很好。

2、使役动词let, have, make后，感官动词see, watch, look at, notice , observe, hear, listen to, smell, feel, find 等词后的to省略。

例：He made the baby crying all night long. 他让那个婴儿哭了一整夜。

Let it be. 就这样吧。

when I passed by, I saw the girl picking the flowers. 我经过的时候，看见那个女孩在摘花。

注意：在这些词的用法中，用于被动语态时不能省去to。

例：I saw him dance. 我看见他跳舞。

=He was seen to dance.
The boss made them work the whole night. 老板让他们整夜干活。

=They were made to work the whole night.
3、would rather/had better 后的to省略。

例：I would rather go to Japan than the USA.我宁愿去日本也不想去美国。

You had better take a hat with you.你最好带上一顶帽子。

4、why…/why not…句型中not后to省略。

例：why not come to my home for a dinner tonight？
今晚何不来我家吃顿饭。

5、help 后可带to，也可不带to, help sb （to）do sth：
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6、but和except后。

but前是实义动词do时，后面出现的不定式不带to。

比较：He wants to do nothing but go out. 他只想出去玩。

He wants to believe anything but to take the medicine. 除了吃这药，他什么都信。

7、由and, or和than连接的两个不定式，第二个to 可以省去：
例：He forgot to go to her home and give her the important letter. 他忘了去她家并把一封重要的信件给她。

8、通常在discover, imagine, suppose, think等词后作宾补时，可以省去
to be。

例：He is supposed （to be）nice. 他应该是个好人。

9、but作介词，后结不定式结构时，前面谓语动词部分若含有do的形式时，but 后的不定式要省去to,否则要带to.
例he wants to do nothing but go out.
He wants to believe anything but to take the medicine.
10、当两个或多个不定式短语由连词and, but或or连接时，后一个或几个不定式符号to常可省去。

但若表示对比、对照关系时，则不能省略。

例he wants to move to France and marry the girl.
The purpose of new technologies is to make life easier, not to make it more difficult.
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11、不定式做表语时，一般要带to,但若主语部分中含有do的各种形式时，符号to可省去。

例we’ve missed the last bus.
All we could do now is walk home.
典型例题
1）---- I usually go there by train.
---- Why not ___ by boat for a change
A. to try going
B. trying to go
C. to try and go
D. try going
答案：D. why not 后面接不带to 的不定式，因此选D。

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2）Paul doesn’t have to be ma de ___. He always works hard.
A. learn
B. to learn
C. learned
D. learning
答案：B. make后接不带to 的动词不定式，当其用于被动时，to 不可省略。