1) I must be going

I must not play in the street

I must exercise every morning

I must do it for you

I must have a good rest

2) I can swim a little

I can speak and read English

I can hear what you say

I can finish this work

I can take you home

3) May I do what I like?

May I ask you a question?

May I go?

May I talk loudly here?

May I sit down?