在改同学雅思写作作文的时候，发现大家对情态动词并没有一个精准的认识，一般都在想当然的使用。各个情态动词之间还是有不小的区别的。墨尔本文波雅思为大家分享一下情态动词的用法。
国外烤鸭看这里：
国内烤鸭看这里：
- 情态动词是什么？
动词 ＋ 情态
（态度，请求，推测……）
- 情态动词的特点
- 无人称和数的变化
- 时态有局限性
- 后加动词原型
- 变成否定疑问时直接后变，不加其他助动词
- 情态动词的用法细分
总述：
- 表示推测
- 表示请求
- 表示建议
- 表示命令
细节：
- 表示推测
- 推测现在
He must be sad.
He has to be sad.
He should be sad.
He ought to be sad.
He could be sad.
He may be sad.
He might be sad.
- 推测过去
He must have been sad.
He could have been sad.
He may have been sad.
He might have been sad.
- 推测将来
He will be sad.
He should be sad.
He ought to be sad.
He may be sad.
He might be sad.
He could be sad.
- 表示请求
- May I …?
May I help you?
- Can/Could I …?
Can/Could you …?
Can/Could you tell me the way to the hotel?
- Will/would you …?
Will/Would you mind smoking here?
- 表示建议
- should do / ought to do
had better do
- 其他类似的表达
Why not do …?
How/What about doing …?
If I were you, I would …
- 表示命令
- must
- have (got) to
- 补充考点：
－Must I finish it today?
－No, you needn’t/ you don’t have to.
Exam link:
I was really anxious about you. You____ home without a word.
A. mustn’t have B. shouldn’t have left
C. couldn’t have left D. needn’t have
—Are you coming to Jeff’s party?
—I’m not sure. I__________ go to the concert instead.
A. must B. would C. should D. might
—Will you stay for lunch?
—Sorry, ____________. My brother is coming to see me.
A.I mustn’t B.I can’t C.I needn’t D.I won’t
Sorry I’m late. I ________ have turned off the alarm clock and gone back to sleep again.
A. might B. should C. can D. will
— Write to me when you get home.
— _________.
A．I must B．I should C．I will D．I can
― I heard they went skiing in the mountains last winter.
― It ______ true because there was little snow there.
A. may not be B. won’t be C. couldn’t be D. mustn’t be
The room is in terrible mess; it _________ cleaned.
A. can’t have been B. shouldn’t have been
C. mustn’t have been D. wouldn’t have been
You _____ her in her office last Friday; she’s been out of town for two weeks.
A. needn’t have seen B. must have seen
C. might have seen D. can’t have seen
If you don’t like to swim, you ___ as well stay at home.
A. should B. may C. can D. would
