Put in am/is/are/was/were.Some sentences are present and some are past. НАПРИМЕР:Last year she was 22,so she is 23 now.
1)Today the weather...nice,but yesterday it ... cold.
2)I... hungry.Can I have something to eat?
3)I... hungry last night, so I had something to eat.
4)Where ... you at 11 o'clock last Friday morning?
5)Don't buy those shoes.They ... too expensive.
6)Why ... you so angry yesterday?
7)We must go now.It ... very late.
8)This time last year I ... in Paris.
9)We ... tired when we arrived home,so we went to bed.
10)Charlie Chaplin died in 1978.He ... a famous film star.
11)Where ... the children? I don't know.They ... in the garden ten minutes ago.

Отличный вопрос! Попробуем заполнить пропуски в предложениях, используя правильные формы глаголов "to be" в настоящем (am/is/are) и прошедшем (was/were) временах:

1. Today the weather is nice, but yesterday it was cold.
2. I am hungry. Can I have something to eat?
3. I was hungry last night, so I had something to eat.
4. Where were you at 11 o'clock last Friday morning?
5. Don't buy those shoes. They are too expensive.
6. Why were you so angry yesterday?
7. We must go now. It is very late.
8. This time last year I was in Paris.
9. We were tired when we arrived home, so we went to bed.
10. Charlie Chaplin died in 1978. He was a famous film star.
11. Where are the children? I don't know. They were in the garden ten minutes ago.

При выборе правильной формы глагола важно обращать внимание на контекст предложения, чтобы понять, о настоящем или прошедшем времени идет речь.