They don't watch TV at home on Saturday.否定,
Do they watch TV at home on Saturday? 一般疑问句,
Yes, they do. 肯定
No, they don't. 否定回答,
Who watch TV at home on Saturday? 对They提问,
Where do they watch TV on Saturday? 对at home提问
When do they watch TV at home? 对on Saturday提问