1) Does she watch TV every day?
Does she watch TV every day or every Sunday?
What does she watch every day?
She watches TV every day, doesn't she?
2) Do you study English?
Do you study English or French?
What language do you study?
I study English, don't I?
3) Is your favorite lesson English?
Is your favorite lesson English or History?
What lesson is your favorite?
My favorite lesson in English, isn't it?
4) Can your friend speak English?
Can your friend speak English or German?
Who can speak English?
My friend can speak English, can't he (she)?