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：
    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：
  V/ p7 o9 m9 z' b    You had better have come earlier. 你本该来得早一点。