求助精通英语的各位大哥大姐。

Question

I think that the doctor had better see you.
此句中，为什么用"had",而不用"have","better"后面为什么不加"to"?

Answer 1

因为这是一个固定句型
had better do sth：最好做某事
记着就行了
举个例子：You had better take the umbrella， It may rain today。
had 在这里不代表have 的过去式
再多说一句，嘿嘿，如果表示 最好不做某事
要用had better not do sth
好了，我说完了，我可是很认真回答这个问题呢，例子都是我刚才自己想的…

Answer 2

had better是情态动词
hadn't better
had +主语＋better

Had better意为“最好”，后接不带to的不定式。如：
— We had better go now.
— Yes, we had (we'd better / we had better).
Hadn't we better stop now? (Had we better not stop now?)
I think I'd better be going. （用于进行时态，表“最好立即”）
You had better have done that. （用于完成时态，表未完成动作）
注：①had best与had better同意，但较少用。②You had better … 用于同辈或小辈，对长辈不可用。
3. Would rather意为“宁愿”，表选择，后接不带to的不定式。如：
I'd rather not say anything.
Would you rather work on a farm?
— Wouldn't you rather stay here?
— No, I would not. I'd rather go there.
由于would rather表选择，因而后可接than。如：
I would rather work on a farm than in a factory.
I would rather watch TV than go to see the film.
I would rather lose a dozen cherry trees than that you should tell me one lie.
I'd rather you didn't talk about this to anyone. （句中的'd rather不是情态动词，would在此是表愿望的实义动词）

Answer 3

have better do sth
“doctor"三单，如果选项有has还可以考虑,have肯定不行