Past Continuous

Use

We often use the Past Continuous when we refer to an action that was happening in the past when another one interrupted it.

ex: He was listening to music when someone knocked at the door.

Form

Affirmative: He was singing a nice song.

to be (past simple) + verb+ing

Negative: He wasn’t singing a nice song.

to be+not (past simple) + verb+ing

Interrogative: Was he singing a nice song?

to be (past simple) + subject) + verb+ing

See table