(+) S + was/were + V-ing
→ He was cooking dinner at 4 p.m yesterday.
They were playing soccer when I came yesterday.
I was going out when it started to rain.
(-) S + wasn’t/ weren’t + V-ing
→ He wasn’t working when his boss came yesterday.
We weren’t watching TV at 9 p.m yesterday.
He wasn't watching that film before Marie finished her work.
(?) Was/ Were + S + V-ing ?
→ Was your mother going to the market at 7 a.m yesterday?
Were they staying with you when I called you yesterday?
What was he talking about?
