let,have ，make,get 作为使役动词都可以表示使……或者让……的意思。我们现在单个分析他们的区别。
1)let: to allow someone to do sth 侧重允许某人做某事。
用法：主语+let+人+动词原形
例如：Jim let me drive his car.Jim 让我开他的车/允许我开他的车。
2)have:to authorize someone to do sth 侧重授权使，让某人做某事。
用法：主语+have/has/had+人+动词原形
例如：He had the mechanic check the brakes.他让修理工检查刹车。在这里是侧重他授权给修理工检查刹车。The government had the officials collect some good advice from the farmers.政府让官员收集来自农民的一些好的建议。这里是政府授权官员做某事。
3)make: to force someone to do sth.侧重强迫使/让某人做某事。
用法：主语+make/made/makes+人+动词原形
例如：She made his son clean his room.她让她儿子打扫他自己的房间。这里侧重的是她带强迫的使，让他儿子去打扫。
4)get: to convince someone to do sth/to trick someone into doing sth.侧重说服某人做某事，或者使花招，诡计欺骗某人去做某事。
用法：主语+gets/got/get+人+ to +动词原形
例如：The students got the teacher to dismiss class early.学生让老师早点下课。这里是学生说服老师早点下课，侧重的是用说服来让某人做某事。
We couldn get him to sign the agreement.我们不会让他签这个协议。暗示的是我们会使花招，诡计，各种方式，让他不要签协议。
