Ответ:

1. was going, saw
2. rang, was having
3. were having, started
4. was sleeping, fell
5. rang, was reading
6. was doing, arrived
7. started, were waiting
8. was going, had
9. met, was wearing

Past Simple

глагол + ed или вторая форма неправильного глагола

Past Continuous

was/were и глагол + ing

was - я, он, она, оно

were - мы, вы, ты, они