2nd form of the Verb / didn't
We watched a great film last week.
Students wrote an essay succesfully.
Did you see him yesterday?
She didn't do the laundry when she was a chlid.
to be (was/were) + V ing
We were watching a film when the phone ring.
While I wasn't doing my homework, my sister was playing with blocks.
He was always talking too loudly.