1. did they invite John to the party yesterday.
when did they invite Jogn to the party?
who invited John to the party yestrday?
did they invite John or Kate at the party yesterday?
they invited John at the party yesterday, didn"t they?
2. has my mother bought buscuits?
what has my mother bought?
who has bought buscuits?
Has my mother bought buscuits or cakes?
my mother has bought buscuits, hasn't she?
3. does my father read newspapers every day?
who reads newspapers every day?
when does my father read newspapers?
does your father read newspapers or books every day?
my father reads newspapers, doesn't he?