had better 用于提建议或表示自己应该做什么事，常略写'd better,意为“最好...”，后面跟动词原形。

We had better start at once .

我们最好马上出发。

We had better get there before it gets dark.

我们最好天黑前到那儿。



He'd better get some sleep.

他最好睡 一会儿。

You'd better not talk so loudly .

你说话最好不要那么大声。



You'd better ask your parents first .

你最好先问问你的父母。



had better的否定式和疑问式

You had better not quarrel with your neighbors whatever happens.

不管发生了什么，你最好不要和邻居吵架。

Had I better not tell anyone about today's discussion?

我最好不把今天所讨论的内容告诉任何人吗？