Als je over iets vertelt/schrijft dat in het verleden bezig/aan de gang was.
was/were + ww + -ing
Bevestigend: I was watching TV last night.
They were helping me to prepare dinner.
Ontkennend: Sorry, I wasn't listening.
They weren't playing the guitar.
Vragend: What was he eating?
Were you making your homework (when I called)?