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You must have a try.
At last
Find out the rules (can)
1. You can help mother do things
I can run.
She can draw.
Find out the rules (can,may)
2.Can I use your dictionary?
You can use my dictionary.
May I cross the river?
You may cross the river.
Find out the rules (must)
You must be careful.
You must have a try.
You mustn’t cross the river.
You mustn’t eat in class.
用法
意义
例句
can
能力
能，
能，会
请求对方允许，许可
可以
may
请求对方允许，许可
可以，可能
must
发出命令，制定规则