can(could) 和 may(might)

sentence:
  Do I have to/Do me a favor?/To be careful/Any thing else?
  I'm his fan/I'm his age/No one knows/Never mind/Count me on
  That's neat/What's news?/Time is up/Is it yours?/Feel better?
  She turns me off./It drives me crazy..

key words and expressions:
  exclaim         呼喊,惊叫            sooner or later      迟早
  go off          爆炸,出去,离去     at any moment        任何时候
  sell out        卖完,出卖              sell up              变卖,为还债而变卖
  as well         还是..好                may as well          最好,还是..好
  neat            整洁的,灵巧的      get the better of    打败,智胜   
  sadly           沮丧地,悲痛地      prefer               更喜欢,宁愿
  get the better end of 占上风,对...占上风,对...处于领先(有利)地位
  rather          宁愿,宁可              pity                  令人遗憾的

Pattern:
  The bomb may go off at any moment.
  What r u in a hurry for?
  He sold his watch at a low price(for 300 pounds).
  I have a meeting for 2 o'clock. 
  John sold up and went to Australia.

Syntax:
  情态动词 can(could)/may(might) 表示可能发生,不确定的推测
  could 比 can 更加委婉
  might 比 may 更加委婉,更加不确定
  Such things may(can) happen.
  This may not(cannot) be true.
  There is nothing to do now,so I might(may) as well go to bed.
  Since u will know it sooner or later,I might as well tell u now.