A
The musician was playing unitil 11:00 p.m. last weekend.
When was the musician playing last weekend?
Yes, he was. (The musician was playing the guitar.)
Was the musician playing the guitar?
Rick and I were talking about healthy habits during last week’s conference.
What were you talking about during last week’s conference?
No, they weren’t. (The other participants weren’t talking about healthy habits.)
Were the other participants talking about healthy habits?
Yes, I was. ( I was eating an ice cream cone during the recess.)
Were you eating ice cream during the recess?