Answer:
.1. He was leaving the bank, when the thieves took his money.
2. At half past four yesterday we were having dinner.
1. He put on his coat and cap, opened the door and went out.
2. When I was coming to the theatre, my friend was waiting for me.
Step-by-step explanation:
The past simple refers to events that happened in the past and that have finished while the past continuous is used when you talk about events in the past that occurred while something else was happening.
1. He was leaving the bank, when the thieves took his money. The past simple is used to talk about an action that occurred in the middle of another action that should be in past continuous.
2. At half past four yesterday we were having dinner. This is a past event that was hapenning at a certain time.
1. He put on his coat and cap, opened the door and went out. These are finished events.
2. When I was coming to the theatre, my friend was waiting for me. This is in past continuous because these are two actions that are happening at the same time.