6. Find and correct the mistakes in the sentences. 0) He was clicking on an icon and nothing happened. 1) Tom was downloading music when his computer was getting the virus. 2) Annabelle visited the zoo when she saw an elephant for the first time. 3) Grandma, were you watching television when Apollo 11 was landing on the moon? 4) They were waiting for the bus when it was starting to snow. 5) The girls were playing tennis when Helen was breaking her arm. 6) Was the computers working this morning when you arrived?

1. Tom was downloading music when his computer got the virus.
2. Annabelle was visiting the zoo when she saw an elephant for the first time.
3. Grandma, were you watching television when Apollo 11 landed on the moon?
4. They were waiting for the bus when it started to snow.
5. The girls were playing tennis when Helen broke her arm.
6. Were the computers working this morning when you arrived?

В Past Continuous ставим длительное действие-фон; короткое событие, происходящее на его фоне, выражаем Past Simple. В предложении 6 подлежащее computers во множественном числе, поэтому используется were.