1)Were Dan and I in the park last Sunday?
2)Were we at the library yesterday?
3)Was I at the sports club on Sunday?
4)Was my brother at the museum last week?
5)Were my friends at the seaside last summer?
6)Was my mother at the sweet shop yesterday?
5.
1. weren't
2.wasn't
3.weren't
4.wasn't
5.wasn't