let 后面要用have，动词原形，再如Let him do it himself.这是非谓语动词的用法，在英语中let，have和make后面接宾语补足语要去掉不定式to，也就是我们常说的接动词原形，如He makes his son read every night. What made him change his mind? I had him arrange for a car.
