1. I was angry yesterday.
2. Were you at home last night?
3. There was a message for you ten minutes ago.
4. Was your friend at I-K last week?
5. He wasn't at school yesterday.
6. They were not on holiday last year.
Объяснение:
was — с существительными в единственном числе + I, he, she, it
were — с существительными во множественном числе + местоимения you, we, they