Для начала поставим предложения в отрицательной форме.
I sleep every day. — I do not (don't) sleep every day.
I slept yesterday. — I did not (didn't) sleep yesterday.
I will sleep tomorrow. — I will not (won't) sleep tomorrow.
Теперь зададим различного рода вопросы :
I sleep every day. — What do I do every day? How often do I sleep? Who sleeps every day?
I slept yesterday. — When did I sleep? What did I do yesterday? Who slept yesterday?
I will sleep tomorrow. — When will I sleep? What will I do tomorrow? Who will sleep tomorrow?
