...那么make/watch/let/please... sb. do sth这个to 是不是必须省略...

help sb. do sth. ---表示帮忙者直接参加此项活动 make/watch/let 这些使役动词后面加动词不定式做宾补时,必须省略to

动词不定式的一般形式是“to＋动词原形”,但在下面情况中to要省略：一、在感官动词see,hear,watch,notice,feel,look at,listen to等及使役动词make,let,have等后作宾语补足语的动词不定式要省略to.如：We saw him get on a bus.The boss often made the workers work for over 12 hours a day....

没有说第二个动词前得加TO呀，make sb. do sth 后的不定式一定要省去to ,即let / make sb do sth 是固定用法，还有第二个动词用ING形式的，如 finish / keep / enjoy doing sth

一、在感官动词和使役动词后作宾补的不定式要省去to.常见的感官动词有feel、hear、see、notice、listen(to)、look at、smell、observe、watch(注视、观看)、overhear(偷听)、perceive(观察)等.常见的使役动词有have、let、make.二、在help后面作宾补的不定式,可以带to也可以不带to 三、不定式(短语)作...

(1)在主动语态中,make , let , hear , see , watch , notice 等词,其后跟省略to的动词不定式(动词原形),在变为被动语态时,必须还原动词不定式符号to.如:We heard him sing this song in the room.He was heard to sing this song in the room.The boss made him work 14 hours a day....

3、三让：三个使役动词let、have、make，表示“让……”。例：Don’t make him do it if he doesn’t want to.如果他不想做这件事的话，就别让做了。4、四看：四个表示“看”的词语look at、see、watch、notice。例：He noticed a thief slip into the house.他注意一个小偷溜进了房子...

回答：在情态动词及助动词后的不定式不带to。 在see,watch,notice,look at, listen to, hear,feel等感官动词的后面作宾语补足语时不写to 在 make,let,have等使役动词之后作宾语补足语时不用写to 一些固定短语,固定结构搭配时不用写。这个得看平常的积累了。

但在ought, have和be后不能省略.2.在make, let, see, watch, hear, notice, feel, have, listen to, look at等动词后(作宾补)Let me hear you play the piano.3.在why引起的某些问句中:Why not try again 4.在had better, would rather, would rather…than, cannot but, do nothing ...

make，have）、“四看”（look at，see，watch，notice）。这四类动词后接省略to的不定式作宾语补足语时，一般表示动作发生的过程已经结束；接doing作宾语补足语时通常表示动作正在进行中或状态。试比较： I heard her sing．我听见她唱了歌。 I heard her singing．我听见她在唱歌。 谢谢采纳！

1.动词不定式作感官动词feel \see \notice \watch \find \hear \listen to \observe和使役动词have \make \let等的宾语补足语时,动词不定式符号to省略.如果这些动词用于被动语态,其后的动词不定式符号to不能省略(但let除外).例如:(1)We often hear him sing the song at home .(=He is often ...