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youd better即you had better，后面加动词原型，构成you had better do sth.句型。意思是"你最好做某事”。这是固定搭配，适用于各种人称和数。had可与主语缩写也可不缩写。
you'd better 后加什么
you’d better后面直接加动词原形，也就是不带to的不定式，构成you had better do sth句型，意思是你最好做某事。
实际上，had better do sth是固定搭配，意思是最好做某事，因为bad better是情态动词，而情态动词的后面接动词原因，所以had better的后面就接do sth。举例如下：
1、You'd better see a doctor about that cough.
你最好找医生治治你的咳嗽。
2、You'd better look sharp or you'll be late.
你得快点，不然就迟到了。
you'd better例句
1、I think you'd better tell us why you're asking these questions.
我想你最好告诉我们你为什么要问这些问题。
2、Now that you are here, you'd better stay.
既然你已经来了，最好还是住下。
3、Maybe you'd better tell me what this is all about
也许你应该告诉我这究竟是怎么回事。