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语法精讲Modal Verbs(1)情态动词—had better,should,ought to 1.had better 1)had better无人称和数的变化，后接不带to的动词不定式，表“义务”或“建议”，语气比should 或ought to更委婉。常译作“最好……”“还是……好”等，可用于第一、二、三人称。否定式为had better no...,疑问式为Had I/you better...?否定疑问式为Had+sb.+better not...?或Hadn’t+sb.+better...? We/You/He had better write it down. 我们/你/他最好把它记下来。 You had better not ask her about it. 你最好不要问她那件事。 —Had you better go at once? —Yes,we had better. No,we’d better not. 2)had better的祈使句形式为Better do sth.。 Better get up at once. 你最好立刻起床。 3）had better have done sth.用于事后的建议，含轻微责备的口吻，意为“当时最好做了某事”，其否定式had better not have done表达相反的含义。 You had better have started earlier. 你当时最好早点出发。 You had better not have scolded her. 你当时没责备她就好了。 2.should | 
