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準情態動詞had better的用法歸納（五“式”）

1. had better的基本式

had better意為“最好”、“應該”，后接動詞原形。如：

You had better set off at once. 你還是馬上動身的好。

You'd better be there. 你最好在那里。

You'd better stay at hospital for another few days. 你最好在醫院再住幾天。

Better have the operation right now. 你最好還是現在就動手術。

2. had better的否定式

通常將not置于had better之后。

We'd better not invite him. 我們最好不要邀請他。

Better not wait for him. 最好不要等他了。

誤：You had not better go. 你最好不要去。

誤：You had better not to go.

正：You had better not go.

3. had better的疑問式

通常將had置于主語之前。如：

Had we better go now? 我們現在該走了嗎？

在否定疑問句或反意疑問句中可將not與had連用。如：

Hadn’t we better go now? 我們是不是現在就去呢?

4. had better+進行式

表示最好馬上做某事。如：

I think I’d better be going．我想我最好還是馬上走。

You’d better be getting your clothes ready. 你最好馬上把衣服準備好。

5．had better+完成式

表示最好做完某事或本該做某事而未做某事。如：

You had better have done that. 你最好把那事做完。

You had better have stayed here. 你本來應該呆在這兒的。