What was ms. Brian doing when you arrived ? (do, arrive)

He was washing his car.

What did he do when you arrived ? (do, arrive)

He offered me a cup of tea.

What were you doing when you saw the accident? (do, see)

I was driving home.

What did you do when you saw the accident? (do, see)

I phoned for an ambulance.

What were you dreaming about when the alarm clock rang ? (dream, ring)

I was dreaming of you.

What did you do when the alarm clock rang ? (do, ring)

I threw it out of the window!

What was your friend watching when you got home? (watch, get)

A football game.

What did you watch when you were there? (watch, be)

The same football game!