1. Nick has not done his homework yet
has Nick done his homework?
has Nick done his or her homework?
who has not done homework yet?
Nick has not done his homework yet, has he?
2.Olga will visit her grandparents next month
will Olga visit her grandparents next month
who will visit grandparents next month
Olga will visit her grandparents next month, won't she?
will Olga or Kate visit her grandparents next month
3. The boys are playing football in the yard.
are the boys playing football in the yard.
are the boys playing football or basketball in the yard.
The boys are playing football in the yard, aren't they?
where are the boys playing football?