使役动词真奇怪，
to在句中象妖怪。
主动句里它走开，
被动句里它回来。
动词let要除外，
to词可来可不来。
使役动词好记忆，一感feel，二听hear、listen to，三使make，let，have四看look at，see，watch，notice。
具体解释如下：
1.使役动词可接动词原形作受词补语。如，
He makes me laugh.
他使我发笑。
I let him go.
我让他走开。
I helped him repair the car.我帮他修理汽车。
Please have him come here.
请叫他到这里来。
2.使役动词还可以接过去分词作受词补语。
I have my hair cut every month.
我每个月理发。
3.使役动词的被动语态的受词补语用不定词,不用原形不定词。
He made me laugh.他使我笑了。
I was made to laugh by him.我被他逗笑了。
4，通常我们说使役动词，
指的是make, have, let这三个动词，它们在后接不定式
作宾语补足语时要省去不定式符号to。如，
I will have him come and help you.
我会让他来帮助你的。
I have them all talking to each other in English.
我鼓励他们用英语交谈。
Let them stay in the classroom and do their exercises themselves.
让他们自己待在教室里做练习吧。
Let AB be equal to CD.
假设AB等于CD.
Let me in and let them out.
让我进来，让他们出去。
The naughty boy was made to stand there for an hour.
这个调皮的男孩被让在那站了一个小时。
They will make an important plan known to the public soon.
他们不久就会让公众知道这个计划。
The news made her happy.
这个消息使她快乐。
