---            has your grandma been like this?   --- Since last night.

I told you that you shouldn't waste your time playing the computer games,_____________?

There is little doubt in your mind that he is innocent,             ? (2012江苏)

—________ will you stay in Shenzhen for your summer vacation?—For about two weeks.

---John and Tom, you two clean the classroom today, _____? ---But we cleaned it yesterday.