let, make, have 这三个，叫做【使役动词】，后面的宾语必须接原形动词。例如：
Let's talk about our new year plan.
但是，如果改成被动语态，make 和have的后面就得改成不定式,
mbt shoes sales。例如：
We made him wash all the dishes.改成被动语态之后，变成：
He was made to wash all the dishes by us.
watch, see, look at, notice, hear, listen 这六个，叫做【感官动词】，后面可以接原形动词(不强调该动词的持续性），也可以接现在分词（强调该动作的 持续性），就是V-ing。例如：
I heard him crying out loudly in the yard.（强调他一直哭，有持续性，所以用V-ing)
I saw him steal your pen.(偷走你的笔，是一瞬间完成的动作，所以不强调持续性，用原形动词）
改成被动语态，宾语的后面，也是改成不定式，我将上面两个句子改成不定式供你参考：
He was heard to be crying out loudly in the yard by me.
He was seen to steal your pen by me.
以上讲解，希望对您有帮助。