1) 三个词分别怎么用
can（能力）
- I can swim.
- She can dance.
must（必须）
- You must wear a seat belt.
should（建议）
- You should go to bed early.
2) 句型
肯定句
- You must do your homework.
否定句
- You must not run in the hallway.
一般疑问句
- Can you help me?
- Should we clean the classroom?
3) 练习
热身（选词填空）
- I ___ ride a bike.（能力）
- You ___ be quiet in the library.（规则）
- You ___ drink more water.（建议）
巩固（改句子）
- You must wear a helmet.（改否定句）
- She can sing.（改一般疑问句）
挑战（造句）
- 分别用 can / must / should 写 3 句和“在学校”有关的句子。
参考答案
- can
- must
- should
- You must not wear a helmet.（更自然的意思通常是：You don't have to wear a helmet. 但这里先练 must not 的形式）
- Can she sing?
- 示例：I can read English. / We must keep the classroom clean. / You should listen to the teacher.