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. Youd better put on my coat. 天相当冷。你最好穿上我的外套。
Shed 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。
上一篇: [情态动词]比较need和dare