1. make & let 这两个动词后面都跟不带to的不定式，但意义和用法有区别
(1)make 名词/代词 不带to的不定式表示“迫使”、“致使”：
That beard makes you look much older than you really are.
What made him change his mind?
（2）在被动语态中含有上述意义的make后面必须带to:
He was made to work fourteen hours a day. 他被迫一天工作14小时
He was made to change his mind. 他被迫改变了主意
2.let 有两种用法，
（1）一种时用于祈使句，建议包括说话者在内的人采取某一行动：
Let's not waste any more time.
否定形式也可用
Don't let's.. Don't let's waste any more time.
（2） let的第2种用法是表示“允许”，其结构与make 相同，即let 名词/代词 不带to的不定式。如果宾语 是 us,则不能缩写成let's
Please let us have more time, will you ?
I won't let you ride my bicycle.
（3） let 后面可以跟一个被动的、不带to的不定式：
He let it be known that the house was his.
3. a. have somebody do sth让某人去做某事
I had him arrange for a car.
b. have somebody doing sth.让某人持续做某事。
He had us laughing al
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