will
1)是表示将来时,所有动作的将来时都可以用will +do来表示,比如will go ; will ask; will
leave
2)will +do,有时候是状态,有时候是瞬间的动作。比如:It will rain tomorrow. 明天会下雨
must,
1) 表示必须、必要。You must come in time.
在回答引出的问句时,如果是否定的,不能用mustn’t(禁止,不准),而用needn’t, don’t have to(不必).
---- Must we hand in our exercise books today?
---- Yes, you must.
---- No, you don’t have to / you needn’t.
2) must是说话人的主观看法,Must只有一般现在时。 he play isn’t interesting, I really must go now.
3) 表示推测、可能性(只用于肯定的陈述句)
1. You’re Tom’s good friend, so you must know what he likes best.
2. Your mother must be waiting for you now.
need
1) need 作情态动词用时, 常用于疑问句、否定句。在肯定句中一般用must, have to, ought to, should代替。
1.You needn’t come so early.
2. ---- Need I finish the work today?
---- Yes, you must. / No, you needn’t.
2) need作实义动词用时, 有人称、时态和数的变化,need后面只能接带to的不定式。 He needs to finish his homework today.
may
1) 表示请求和允许。Might/ May I smoke in this room?
2)用于祈使句,表示祝愿。May you succeed!
3) 表示推测、可能性(不用于疑问句)。He may /might be very busy now.
希望能帮到你
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