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哪些情況下不定式要省略to

1. 在let, make, have等使役動(dòng)詞后用作賓語(yǔ)補(bǔ)足語(yǔ)的不定式必須省略to。如：

He had his son clean the car. 他叫他的兒子擦車。

Rain makes plants grow. 雨水使植物生長(zhǎng)。

We can't let this go on. 我們不能讓這個(gè)情況繼續(xù)下去。

注：當(dāng)使役動(dòng)詞用于被動(dòng)語(yǔ)態(tài)時(shí)，要補(bǔ)上在主動(dòng)語(yǔ)態(tài)中省略的to(主要是指make，let和have很少用于被動(dòng)語(yǔ)態(tài))。如：

He was made to work long hours. 他們讓他長(zhǎng)時(shí)間干活。

2. 在see, hear, observe, notice, feel, watch等感覺(jué)動(dòng)詞后用作賓語(yǔ)補(bǔ)足語(yǔ)的不定式必須省略to。如：

I saw him stand up and go out. 我看見他站起來(lái),然后就走了出去。

She noticed the man look [looking] at her a couple of times. 她注意到那個(gè)男人朝她看了好幾次。

I felt something crawl up my arm. 我覺(jué)得有什么東西順著我的胳膊向上爬。

注：若它們用于被動(dòng)語(yǔ)態(tài)或用于完成式，則其后的不定式要帶to。如：

I noticed her to have come early. 我注意到她來(lái)得很早。

He was seen to enter the building. 有人看見那男子走進(jìn)大樓。

另外注意，若動(dòng)詞feel后用作賓語(yǔ)補(bǔ)足語(yǔ)的不定式為 to be，則要帶 to(其他情況不帶 to)。如：

They felt the plan to be unwise. 他們認(rèn)為這個(gè)計(jì)劃不明智。

3. 在動(dòng)詞help后用作賓語(yǔ)或賓語(yǔ)補(bǔ)足語(yǔ)的不定式可以不帶to：

I helped him (to) repair his bike. 我?guī)退�修自行�?/SPAN>

注：當(dāng)help用于被動(dòng)語(yǔ)態(tài)時(shí)，不定式前的to不能省略。如：

The boy was helped by a woman to collect his scattered coins. 那男孩由一個(gè)婦女幫他撿拾散亂一地的錢幣。

另外，若 help 之后接一個(gè)較長(zhǎng)的名詞詞組作賓語(yǔ)或其中的不定式所表示的動(dòng)作主語(yǔ)不直接參加，則不定式通常帶to。如：

Help the little boys at the back of the hall to carry the chairs out. 請(qǐng)幫大廳后面那些小男孩把椅子搬出去。

These tablets will help you to sleep. 這些藥片將對(duì)你的睡眠有幫助。