文字/稀有的魚兒
不定式基本形式：to+動(dòng)詞原形，其中有一部分不定式是沒有to的瞎颗，那么哪些情況下件甥，不定式?jīng)]有to呢捌议？
1、感官動(dòng)詞
這幾個(gè)感官動(dòng)詞feel ,hear ,smell,look,在主動(dòng)語態(tài)里后接動(dòng)詞原形(無to)引有。
例如：
I saw him sing.
I heard you play the piano.
He feels him fly.
I watched the girl cross the
road.
2瓣颅、使役動(dòng)詞
使役動(dòng)詞let、 have 譬正、make后接不定式?jīng)]有to.
例如：
You must have your son see his own mistakes.
Let me go.
Don't make her laugh.
3宫补、在why not 后沒有to，基本結(jié)構(gòu)可記憶why not do 更容易
(1)表示提建議
例如：
Why not go with him?
Why not have a rest?
（2）表示認(rèn)為沒有必要
例如：
Why worry. you can't do anything about it ?
Why waste?
4曾我、had better do 最好做…和
would rather do 寧可做…后面的不定式?jīng)]有to. '
You'd better drink the water
now. or you will not be fine.
I would rather go by bus now
5粉怕、Will you please do 征求意見，求助抒巢。
例如：
Will you please open the window?
Will you please give me a
hand ?
6贫贝、help 可以有to 也可以沒有
to
Help the boy to carry the
heavy box.
Help the old man water the
flowers.
7、can't … but …虐秦，do nothing …but…結(jié)構(gòu)中沒有to
例如：
We can't choose but obey（服從）
He can't help but feel sorry for her.
We do nothing but wait.
以上是常用的不定式中不帶to的幾種情況平酿，但是如果在被動(dòng)語態(tài)中還是有to的，例如：
I saw her dance
She was seen to dance
Make her laugh
She was made to laugh
這些情況在被動(dòng)語態(tài)里在詳細(xì)講解悦陋。
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