you'd better not后面加什么形式

you'd better not后面直接加“动词原形”。you'd better not是you had better not的缩写，而had better（not）do sth是固定搭配，意思是你最好（不要）做某事，故you'd better not后面应该直接加动词原形。

you'd better not do sth

一、释义

you’d better全拼为you had 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，而you'd better not中间多加了一个否定词“not”，所以其句意就变成了“你最好不要做某事”。

二、接“动词原形”

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，同理多一个否定词not的you'd better not也要加动词原形的原因。

三、双语例句

You'd better not read in that dim room. 

你最好不要在那个昏暗的房间里看书。

You'd better not take that bulky piece of luggage. 

你最好不要带那件笨重的行李。

He has a strong backing, and you'd better not set yourself against him. 

他有背景，你最好别跟他拗。

You'd better not stay out with your friends. You need to come back by 9 p.m. 

你最好不要和你的朋友待在外面。你必须在晚上9点以前回来。

You'd better not be here when I get back. 

在我回来的时候你最好别在这。

You'd better not have one if your liver's bad. 

要是你的肝不好，你最好一杯酒也别喝。