Important thing: These three words were in the key of one of my grammar book. Maybe the book would like to get the best possible solution (I mean, you have to use all the conjunctions up).
When Paul was trying to ring them, nobody answered the phone.As Pat was coming downstairs, she heard a shot.
While my father was watching TV, I was swotting the English words.
In your examples, they are interchangeable. Note: I don't know the word swotting , Note: As can also mean because . We didn't order lunch as we had eaten a late breakfast.
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Hole One a New See1. When Paul was trying to ring them, nobody answered the phone. 2.As Pat was coming downstairs, she heard a shot. 3.While my father was watching TV, I was swotting the English words.I don't think they are completely interchangeable.