感官动词
see, watch, look at, notice, observe, hear,listen to, smell, feel, find等后作宾语省略to
在被动语态中不能省略
I saw her dance.
She was seen to dance.
The boss made them work the whole night.
They were made to work the whole night.
help 可带可不带
help sb.(to) do sth.
口诀
一感
feel sb. do sth.
二听
listen to/hear sb. do sth.
三使
let/make/have sb. do sth.
四看
see/notice/observe/watch sb. do sth.
半帮助
help sb.(to) do sth
