I was cooking dinner while he was doing homework.
Past continuous
Simple past
Past perfect
We were watching TV when the lights went out.
Past continuous+simple past
Simple past
Past perfect
Past continuous
He was singing in the shower.
Simple past
Past perfect
Past continuous
I watched a movie last night.
Past perfect
Simple Past
Past continuous
They had studied English before they moved to Canada.
Past perfect
Simple past
Past continuous
I had never seen snow before that day.
Simple past
Past continuous
Past perfect
By the time the bus came, I had been waiting for 30 minutes.
Simple past
Past perfect
Past continuous
We played soccer after school.
Simple past
Past continuous
Past perfect
I met him at the party.
Simple past
Past continuous
Past perfect
He broke his leg while he was skiing.
Past perfect
Simple past + Past continuous
Past continuous
Simple past
They had already left when we arrived.
Simple past
Past continuous
Past perfect
She was reading when I called her.
Past continuous
Past perfect
Simple past