(+) I / He / She / It = was + hele werkwoord + ingI was playing football
(+) You / We / They = were + hele werkwoord + ing
We were swimming all day yesterday
(-) I / He / She / It = was not + hele werkwoord + ing
Kyle wasn't running around the house, he was doing his homework.
(-) You / We / They = were not + hele werkwoord + ing
Stan and Eric were not having a fight, they were just playing.
(?) was + I / He / She / It + hele werkwoord + ing
Was he playing football?
(?) were + You / We / They + hele werkwoord + ing
Were you playing football at 3 o'clock?