hadbetter是一个固定词组.doc

had better是一个固定词组，相当于一个情态动词，意思是“最好”、“还是……为好”，用来表示建议或劝告，比should, ought to语气更委婉些，但用法较为复杂。现将其用法要点归纳如下： １．had better 是一个习惯用法，其中had better指是现在或将来，它没有人称、时态和数的变化，在各种人称、时态和数的变化，在各种人称代词后可缩写为＂’d better ”。例如： You ( I, We , They, He ) had better stay at home in the evening. 2. had better 后跟动词原形。 (正）You had better come before eight. (误)　You had better to come before eight. 你最好八点钟以前来。 3. had better 的否定形式为had better + not +原形动词 (正）You had better not go alone. (误) You had not better go alone. 4. had better 的一般疑问句形式为Had +主语+better…?或Hadn’t +主语+better…? Had I better come here early tomorrow? 我明天早点来好吗? Hadn’t we better wait until the rain stops? 我们等到雨停不好吗? 5.含有had better的反意疑问句,其问句部分用had 或should, 不可用did;它的形式为had+主语或hadn’t +主语。 He had better not take off his sweater, had (should) he? You had better go to see a doctor, hadn’t (shouldn’t)you? 6. had better 在间接引语中，即指的是过去时间也没有其它词形变化。 We were told that we’d better hurry up. 叫我们最好快一点。 7. had better后面用“have+过去分词”表示虚拟语气。 You had better have gone already. 假如你去了该有多好。（可惜事实上并没有去）