Сделайте четыре предложения с глаголом tobe : повествовательное, отрицательное и вопросительный.

Present:
I am writing.
He is playing.
Is she cooking?
They are not swimming.

Past:
I was playing tomorrow at this time.
He was swimming yesterday at five o'clock.
She was not cooking yesterday at seven o'clock.
Were you doing your homework at this time yesterday?