1. can引导的疑问句
Can I help you?
我能帮你吗？
Can you move the desk away?
请你把桌子移走好吗？
Can I get the result?
我可以知道结果吗？
Can you help me, please?
你能帮我吗？
2. can't+动词原形
You can't play basketball.
你不能玩篮球。
He can't arrive on time.
他不能准时到达。
We can't begin with nothing to do.
我们不能开始就无所事事.
She can't be there.
她不可能在那儿。
3. must+动词原形
You must finish it today.
你一定要在今天完成它。
You must see the doctor.
你一定要看医生。
I must go now.
我现在必须得走了。
We must try the new ways.
我们必须尝试这些新方法。
4. mustn't+动词原形
We mustn't think only of ourselves.
我们不能只考虑自己。
You mustn't take photos here.
你不能在这里照相。
You mustn't park the car here.
你不能在这儿停车。
We mustn't break the rule.
我们不能破坏规则。