We often use the past simple and the past continuous, the past continuous describes the longer action or situation and the past simple describes the shorter.
While I was talking to Roger, Rob ran past.
Clauses in the past continuous are often introduced by while and as.
Somebody stole my clothes while I was swimming.
While I was sleeping, my sister woke up and ran away.
As he was watching TV, she entered the room.
Clauses in the past simple are often introduced by when.
He was going fast when his car hit the tree.
When I saw him, he was talking to Helen.
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