15.
2 Sarah didn't begin to read a new book last Tuesday.
3 Mary didn't meet her friends in Leeds last autumn.
4 They didn't eat pizza for lunch 2 days ago.
5 We didn't drink coffee for breakfast when we were students.
6 Len didn't write a funny story yesterday.
7 Nina didn't do her room last Sunday.
8 I didn't give my sister a call yesterday.
9 They didn't go to the country last weekend .
10 Pete didn't see Nick at the party last Sunday.