had02better用法总结

　　主语不论是第几人称，句子不论是什么时态，都要用had better的形式。如：

　　Now you(he，we) had better listen to the teacher.你(他，我们)现在最好听老师讲。

　　had better可用于的时态。

　　1.had better用于指现在。如：

　　Now you had better listen to the radio.你现在最好听收音机。

　　You had better be quiet.你最好安静一些。

　　2.had better用于指将来。如：

　　You had better start tomorrow.你最好明天动身。

　　We had better buy the more expensive one. It will last much longer and so it will be cheaper in the end.我们最好还是买贵些的,它更经久耐用，所以到头来，它还是更便宜些。

　　3.had better用于进行式，表示讲话人提出建议时，动作正在进行。如：

　　We had better be watching the TV play.我们最好现在就看到电视剧。

　　We had better be starting back now.我们最好现在就动身回去。

　　4.had better + have + V-ed可表示"本该做而没有做的事"。如：

　　You had better have done it .如果你把那件事办妥就好了。(但实际上你没有那样做)

　　You had better have stayed with us .要是当时你和我们呆在一起多好啊。(实际上没有)

　　had better的否定式。如：

　　常用的否定形式是将否定副词not直接放在had better的后面。如：

　　You had better not miss the last bus.你最好不要错过末班公共汽车。

　　You had better not leave for Nanjing the day after tomorrow.你最好后天不要动身去南京。

　　注意：否定副词not绝不能放在had的后面。如：不能说：You hadn't better go.而应该说：You had better not go.

　　had better的疑问式。

　　had better通常不以普通疑问句的形式出现。但有时用于否定疑问句，常用Hadn't+主语+better...?结构,作为一种劝告形式，比肯定形式的语气更婉转一些。如：

　　Hadn't you better take an umbrella?你不认为该带一把伞吗?

　　Hadn't you better ask him first?你不认为该先问问他吗?

　　had better在反意疑问句中。

　　在反意疑问句中，疑问部分一般用"had+主语？"，但有时可用"will you?"表示一种请求或建议。如：

　　You'd better not go out today, had you? 今天你最好不要外出，好吗？

　　I must stay at home this afternoon. You had better come to my house, will you?今天下午我必须留在家里，你最好来我家，好吗？

　　在祈使句中，had有时可以省略。如：

　　Better not do it .最好别做那事。

　　Better not wait for them.最好不要等他们。

　　had better的被动式。

　　You had better do it.->It had better be done.

　　You had better have done it.->It had better have been done.