Как правильно in saturday, on saturday, или at saturday?

5) they were at the party, were not they?

6) he will not be back, will he?

7) she could help us, could not she?

8) you have no mercy, have you?

9) we have some food, have not we?

10) he will be here, won't he?

11) it's not tasty, is it?

12) it was good, was not it?

listen, ivan singing in the room.

he doesn't see that i look at it, as he reads something with a great interest.

call him now. i think that he doesn't sleep yet.

look at the person who sits at a window. he/she is our lawyer.