第二部分 ： 简单句的核心变化（情态）

3. 情态

用法：

1. 情态动词 + 动词原型 2. 情态动词的人称变化无 3. 情态动词的动态变化有限 4. 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：

1. In order to be a good salesclerk, you (must not/will not) be rude to a customer.
2. This pie is very good. You (should/must)try a piece.
3. Rice (should/must/may) have water in order to grow.
4. Don't be nervous. I think you (can/must) make it.
5. 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