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　　Only after being asked three times did he come to the meeting.

　　如果句子为主从复合句，则主句倒装，从句不倒装

　　Only when he is seriously ill, does he ever stay in bed.

　　1) 表示允许或请求;表示没有把握的推测;may 放在句首，表示祝愿。

　　May God bless you!

　　He might be at home.

　　注意： might 表示推测时，不表示时态。只是可能性比may 小。

　　2) 成语： may/might as well，后面接不带to 的不定式，意为"不妨"。

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

　　典型例题

　　Peter ___come with us tonight, but he isn‘t very sure yet.

　　A. must　　B. may　 C. can　 D. will

　　答案B. 表可能性只能用may.　此句意可从后半句推出。