A:were you at school yesterday?

B:

 

A:was your at home on saturday?

B:

 

A:were you with your friend last night?

B:

 

A:were you in bed early on sandays

B:

1) Yes, I was. I was at school yesterday.
2) Yes, she was. My mother was at home on Saturday.
3) No, I wasn't. I wasn't with my friend last night.
4) Yes, I was.   I was in bed early on Sunday.