Simple Past negative with to be - (wasn't, weren't)

Simple Past negative: Fill in the correct for of wasn't or weren't (short form).

1. The football shirts were in the bag.
The football shirts in the bag. (Simple Past: wasn't or weren't)
2. It was dark at 10 o´clock.
It dark at 10 o´clock.  (Simple Past: wasn't or weren't)
3. The tickets were expensive.
The tickets expensive. (Simple Past: wasn't or weren't)
4. The exercise was easy.
The exercise easy. (Simple Past: wasn't or weren't)
5. Your mum was late.
Your mum late. (Simple Past: wasn't or weren't)
6. They were at home yesterday.
They at home yesterday. (Simple Past: wasn't or weren't)