-Might I watch TV after supper?

　　-Yes, you may. /No, you mustn't.

　　--晚饭后我可以看电视吗？

　　--可以。/不可以。

　　2．表示推测(多用于肯定句和否定句中)

　　She may not know about it.

　　她可能不知道这件事。

　　3．may放在句首表示祝愿。

　　May you succeed.

　　祝你成功。

　　4．may/might as well do ..."不妨做......；还是做......的好"。

　　If that is the case, you might as well try.

　　如果事情是这样的，你不妨一试。

　　三、must与have to

　　1．have to着重于外界的压力，有"不得已而为之"的意思；must则强调内在职责的影响，一般仅用于现在时和不久的将来时。

　　My sister is ill, so my mother has to look after her.

　　我妹妹病了，所以我妈妈不得不照顾她。

　　We must help each other.

　　我们必须互帮互助。

　　2．must表示必须，构成的反意疑问句，否定回答用needn't 或don't have to。

　　-Must I go now?

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

　　--现在我必须走吗？

　　--是的，必须。/不，你没必要走。

　　3．must表示推测，只用于肯定句。

　　He must be at home now, because the light is on.

　　他一定在家，因为灯亮着。

　　4．must表示固执坚持(用于条件句或疑问句中)。

　　If you must smoke, go to the smoking area.

　　如果你一定要吸烟，到吸烟区去。

　　集中演练1

　　1－1.单句改错

　　①-Could I go now?

　　-Yes, you could.第二个could→can

　　②May it be true？May→Can

　　③Might that day come soon. Might→May

　　④-Must I answer all the questions?

　　-No, you mustn't.mustn't→needn't/don't have to

　　⑤You must work hard nowadays to make a living.must→have to

　　1－2.完成句子

　　⑥他有时会很粗心。

　　He can be very careless at times.

　　⑦--我已经72小时没睡觉了。

　　--你一定筋疲力尽了。

　　-I've had no sleep for 72 hours.

　　-You must be exhausted.

　　⑧他现在不可能在家。

　　He can't be at home now.

　　⑨你与其把钱花在赌博上，不如把它丢掉的好。

　　You might as well throw your money away as spend it in gambling.

　　⑩如果你非得做点什么的话，那就喝点茶吧。

If you must do something else, have some tea.