Модальные глаголы. Употребление в различных типах предложений

Модальные глаголы в английском языке

I can dance.
I must go now.
I have to be at 9 o’ clock.
May I leave the classroom?

Отрицательные предложения
I can not play the piano.
I must not do this.
I may not go to a disco.
He doesn’t have to go to school on Saturday.

Вопросительные предложения
Can you write in English?
Must you go right now?
May I leave the classroom?
Do you have to wear a uniform at school?