像let这样后面加动词原形的词有哪些？

" let , have to , make " 等使役动词
let sb do sth
have to do sth
make sb do sth

" must , may , could , should , need , may , can "等情态动词

help sb do sth (也可换为 help sb to do sth )

make 后面只跟原形
see/notice/hear/watch这类后面可跟原形也可跟动名词，区别我就不说了
还有这些都是在主动语态的条件下，被动语态就要加to

must
need
have to
may
should等情态动词