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It was used for actions that were happening at a specific time in the past.

Subject	Verb to be	Verb+ing
You They We	were	Wrting, Reading, Listening......etc
I, He, She,It	was	Writing, Reading, Listening......etc

Afirmative sentences 

Subject + auxiliary verb (to be) + verb+ing. 

Negative Sentences

Subject + auxiliary verb (to be) + "not" + verb+ing.

Interrogative Sentences 

Auxiliary verb (to be) + subject + verb+ing? 

Uses 

1.It is used for an action in development in the past when another action interrupts it.

2.To talk about actions at a specific time in the past. 

3.For two actions that were occurring at the same time in the past.