might

1.May I make a suggestion?里的May I...?有“你允许我…么？”的意思，是请求对方同意的一种客气语式。Might I...?比May I...?更客气些。这两句在语法上是疑问句，所以末尾用问号，但因为实际上等于请求句，所以也可以用句号。

2.You might...有时作“请你…”解，如You might tell me your new address。有时作“你该…而竟不…”解，如You might make a little less noise。You might have...（过去分词）往往作“你本该…而竟不曾…”解。例如：You might have written to me earlier.

3.说“也许曾经”该用may have...（过去分词），不可用might，如可以说He may have seen her yesterday（他也许曾经在昨天看见她），不可说He might see her yesterday。He might have seen her yesterday的意思是“他本来可以在昨天看见她［但实际不曾看见她］”。