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21.9 had better

21.9 had better表示"最好",相当于一个助动词,它只有一种形式,它后面要跟动词原形。例如:

  It is pretty cold. You'd better put on my coat. 天相当冷。你最好穿上我的外套。

  She'd better not play with the dog. 她最好不要玩耍那条狗。

  had better have done sth表示与事实相反的结果,意为"本来最好"。例如:

  You had better have come earlier. 你本该来得早一点。

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