в present simple.
1/ You visit parents.
2/ - You do not visit parents.
3/общий вопрос? Do you visit parents?
4/ кто Who visits parents?
5/кого посищял Who do you visit?
present continous.
1/ . You are visiting parents.
2/ - You are not visiting parents.
3/общий вопрос? Are you visiting parents?
4/ кто Who is visiting parents?
5/кого посищял Who are you visiting?
present perfect.
1/ . You have visited parents.
2/ - You have not visited parents.
3/общий вопрос? Have you visited parents?
4/ кто Who has visited parents?
5/кого посищял Who have you visited?
Do they go to school on Saturdays?
Did he watch TV yesterday?
When do they go to school?
When did he watch TV?
Do they go to school on Saturdays or on Fridays?
Did he watch TV yesterday or last week?
They go to school on Saturdays, don't they?
He watched TV yesterday, didn't he?