They set out early so that they might arrive in time.

　　2. 惯用形式 may (might)as well＋动词原形：不妨做……

　　If that is the case, we may as well try.

　　Now that they were all here, she might as well speak her mind.

　　【疑难点击】

　　3. 表示祝愿(不用might)。采用部分倒装语序：may＋主语＋动词原形＋……！

　　May you succeed!

　　May the friendship between our two peoples last forever!

　　(三)must，have to的用法

　　1. must 表示“必须”。强调主观看法，只有现在时形式，否定式是must not(mustn't)，表示“禁止”，“不准”。

　　Everybody must obey the rules.

　　You mustn't speak like that to your mother.

　　— Must I be home before eight o'clock?

　　— Yes, you must. / — No, you needn't./No, you don't have to.

　　2. must表示有把握的推测，意为“一定，肯定”，用于肯定句中。

　　You must be hungry after the long walk.

　　Home cooking must be more delicious.

　　3. have to表示“必须，不得不”，着重强调客观需要，能用于更多时态(过去式和将来式)。

　　The students today will have to know how to use computers.

　　As he had broken his leg, he had to lie in bed.

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