Eg.---Why isn’t he in class?
---- He may be sick.(生病的可能性较大)
—--- He might be sick.(生病的可能性较小) ②may/might表示“允许”,may用于现在时或将来时,might常用在间接引语中表过去时,但might也可用于现在时间,表示比较委婉的语气,回答用may。如: He says we may leave. He said we might leave. ③may / might 表示建议或请求,但might比may 更客气,意思更肯定而无过去时态的含义。 —May / Might I use your bike?
—Yes, you can / may. ----No, you mustn’t (3)must ①must表示必须,应该,没有时态变化。如: You must do everything as I do. ②must表示肯定的推测。如: The light is still on, so he must be at home. ③mustn’t 表示禁止做某事。如: You mustn’t smoke in the office. (4)have to have to 表示“必须、不得不”,是由于某种外界(客观)原因而“必须”,“不得不”做某事,也可表示经常的或习惯性的事“必须”做。have to的否定形式表示不必。have to可用于多种时态中。如: You will have to clean your own boots when you join the army. I have to be at my office every evening. (5)should / ought to ①should和ought to表示应当、应该,前者比后者语气轻。如: You should / ought to work hard. ②should / ought to的否定形式表示禁止之意。如: Children shouldn’t smoke. ③should可表示陈述意见,推出建议或请求;而ought to可以表示劝告之意。如: You ought to respect your parents. He suggested that they should leave at once.
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