否定式是在情态动词后加not,疑问式是将情态动词放在主语之前。
如:The radio can’t be mended in four hours.这台收音机在四个小时内修不好。
Waste paper shouldn’t be thrown here.废纸不应该被扔在这里。
【巩固训练案】
I. 单项选择题。
(
) 1. Young trees should ________every day.
water
B. watered
C. be watering
D. be watered
(
) 2. It’s a rule in my class that our classroom ____________before 6:00 p.m. every day.
A. be able to clean
B. should be cleaning
C. must clean
D. must be cleaned
(
) 3. Even a drop of water __________because it is so important to all the living things.
A. must waste
B. mustn’t be wasted
C. mustn’t waste
D. must be wasted
(
) 4. My watch doesn’t work, I want to get it _________tomorrow.
A. repaired
B. repairs
C. repair
D. repairing
(
) 5. The windows must __________before you leave the room.
A. be closed
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