是"一感二听三让四看半帮助".

一感:feel

二听: hear , listen to ,

三让: make , have ,let

五看: see, watch , look at . observe , notice

半帮助: help (指其后的不定式可带可不带to)

这些动词后,如跟不定式作宾补,则在主动语态中, 不定式不带to,但在被动语态中要带to,如:

He felt something move beside him...

他感觉身边有什么东西在动.

I heard the girl sing an English song .

He often makes his sister cry .

His sister is often made to cry .

Have you seen a young man pass by

Mother watched her son play in the park .

Can you help me (to) carry the box ?

Let me have a try .

Please listen to the man tell the story .