had better 相当于一个助动词，它只有一种形式，它后面要跟动词原形。
had better do sth
had better not do sth
It is pretty cold. You'd better put on my coat.
She'd better not play with the dog.
had better have done sth表示与事实相反的结果，意为"本来最好"。
You had better have come earlier.
小学英语语法
had better表示"最好"
责任编辑：小西瓜
发表时间：2014年09月12日 08:49
浏览次数：711
No.A57277
上一篇：
would rather表示"宁愿"
下一篇：
比较have to和must
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