1) My father isn't a doctor.
2) He doesn't work at a hospital.
3) The girl doesn't have a nice dress.
4) You mustn't be serious.
5) Yesterday we didn't visit our Granny.
6) I will not invite her to the party.
7) She isn't sleeping now.
8) I don't have breakfast at 7
9) They haven't passed their exams.
10)We weren't busy yesterday.