Forming the past continuous tense

Subject BE -ING Form

I was singing

You were singing

He was singing

She was singing

It was singing

We were singing

They were singing

Interrupting actions

when

I was cleaning when she arrived.

                                                                            

Continuous Actions

ING

At five o'clock, it was raining.

2 Concurrent Actions

While/As

While I was sleeping, she was working.