21.3 比较may和might
 
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。