Today is Thanks Giving.
Is today Thanks giving?
Today is not thanks giving.
When is thanks giving?
People always have parties on National day.
Do people have parties on National Day?
People do not have parties on National day.
What do people usually do on National day.
I watched moon on mid-autumn day last year.
I did not see moon on mid-autumn day last year.
Did you see moon on mid-autumn day last year?
Who saw moon on mid-autumn day last year?