托福语法指导：had better表示最好

会计考友

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：
4 C2 r5 k' _: ]+ G4 S4 K    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：
$ u' b" b2 a8 q+ O/ D. [/ W    You had better have come earlier. 你本该来得早一点。