3. 情态
用法：
- 情态动词 + 动词原型
- 情态动词的人称变化无
- 情态动词的动态变化有限
- 情态动词变否定/疑问
四六级常用的情态动词有：
| 现在时 | 过去时 |
|---|---|
| must | 无 |
| can | could |
| will | would |
| shall | should |
| may | might |
must “必须” can/could“能够，可以” will/would“愿意/将要”
may/might“可以，可能” should“应该”
1 情态动词表示情态
We must finish the work within a week.
Air pollution must be taken seriously.
The government can solve the problem of water pollution.
Tony could walk when he was only one year old.
Will you marry me?
I will travel abroad with my family.
Potential buyers would cheer for lower interest rates.
To some extent.expressions may influence emotions.
Such bodily reaction might help moderate the work stress.
Students should work hard to pass the exams.
Those sick people should seek help from doctors.
2 情态动词表示推测
The details may be unknowable.
Such searches must take years.
The loss of patience can potentially have a damaging impact on our professional and personal wellbeing.
The way of saying those things may have led to misunderstanding.
Now something similar could be happening in the South Africa.
练习：
- In order to be a good salesclerk, you (must not/will not) be rude to a customer.
- This pie is very good. You (should/must)try a piece.
- Rice (should/must/may) have water in order to grow.
- Don’t be nervous. I think you (can/must) make it.
- I am not sure. Probably he (may/should) come later.
第一题
1.must not
第二题
2.should
第三题
3.must/should
第四题
4.can
第五题
5.may
