Don't talk loudly in public.

Don't talk loudly in public.

1 Don't talk in class.

Don't talk in class.

We can't be late for class.

We must not be late for class.

We should come to class on time.

Don't play football in the street.

Don't play football in the street.

Don't play basketball in the classroom

Don't play basketball in the classroom

Don't lie.

Don't lie.

You can't go to bed too late.

You should go to bed early.

She can't sing because she is too shy.

She is too shy to sing in public.

He can't come to class because he is ill.

He can't come to school because he is ill.

I can't finish my homework because I have a headache.

I can't finish my homework on time because I have a headache.