When the train ___________ (start) moving, he ____________ (wave) goodbye.
When the train started moving, he was saying goodbye.
She ____________ (listen) to music when I __________ (call) her.
She was listening to music when I called her.
He __________ (study) when they ___________ (call) him.
He was studying when they called him.
You ___________ (work) when I _________ (meet) my friends.
You were working when I met my friends.
When my mom ____________ (go) back home, my brother ___________ (play) videogames.
When my mom a}went back home, my brother was playing videogames.
They ___________ (have) coffee when they ___________ (meet) tehir friend.
They were having coffee when they met their friend.
He ___________ (play) quidditch when he ___________ (catch) the golden Snitch.
He was playing quidditch when he caught the golden Snitch.
Lucius ___________ (yell) at Harry when Dobby ___________ (find) a sock.
Lucius was yelling at Harry when Dobby found a sock.
He __________ (watch) a movie when the lights _________ (go) out.
He was watching a movie when the lights went out.
Ron _____________ (drive) when he __________ (see) the Whomping Willow tree.
Ron was driving when he saw the Whomping Willow tree.
When he ___________ (meet) his friend, he ___________ (walk)
When he met his friend, he was walking.
They _____________ (cook) when he ____________ (arrive).
They were cooking when he arrived.
They _____________ (wait) for the teacher when the cat __________ (transform) into her.
They were waiting for the teacher when the cat transformed into her.
They __________ (sing) when the teacher __________ (tell) them to make silence.
They were singing when the teacher told them to make silence.
Last week, he ___________ (not-sleep).
Last week, he didn't sleep.
I _____________ (go) to school when you ___________ (see) me.
I was going to school when you saw me.
When you ___________ (call) her, she ___________ (bake) cake.
When you called her, she was baking cake.
I ___________ (not-go) to school yesterday.
I didn't go to school yesterday.
Hermione ___________ (practise) when Ron __________ (interrupt) her.
Hermione was practising when Ron interrupted her.
Harry ____________ (play) quidditch when it ___________ (start) to rain.
Harry was playing quidditch when it started to rain.
She ___________ (dance) when her brother ___________ (arrive).
She was dancing when her brother arrived.