We use it for 2 or more  actions which  happened one after the other:

 He got up, went to the bathroom  and had a shower.

 1  We use it for 2 actions going on at the    same time in the past:

 I was reading a book WHILE/AS my  brother was listening to music.

 2   A long action was going on when it was  „interrupted“ by a short one:

 WHILE/AS he was driving, he saw a car  crash.  OR

Exercises.

Exercises.

Exercises.

Exercises.

The Past Simple and the Past Cotninuous.

Parts of the house.

Furniture. 

The Mysterious Stalker