While I drove, I was seeing an accident.

While I drove, I saw an accident.

While I was driving, I see an accident.

While I was driving, I saw an accident.

I was eating dinner when the lights was going out.

I ate dinner when the lights went out.

I was eating dinner when the lights went out.

was sleeping, was breaking, knew

am sleeping, is breaking, know

was sleeping, was breaking, was knowing

was sleeping, broke, knew

I was walking down the street when I met my old friend.

I walked down the street when I met my old friend.

I was walking down the street when I was meeting my old friend.

I walked down the street when I was meeting my old friend.

While I was cooking, the phone was ringing.

While I cooked, the phone rang.

While I was cooking, the phone rang.

While I cooked, the phone was ringing.

I was driving home when I saw a car accident.

I was driving home when I saw a car accident happen.

I drove home when I saw a car accident happen.

I was driving home when a car accident happened.

While I was watching the movie, I realized I had left the oven on.

While I watched the movie, I realized I had left the oven on.

While I was watching the movie, I realized I left the oven on.

While I watched the movie, I realized I left the oven on.

As I walked down the street, I heard a strange noise.

As I was walking down the street, I was hearing a strange noise.

As I was walking down the street, I heard a strange noise.

As I walked down the street, I was hearing a strange noise.

I was just about to leave when the phone was ringing.

I was just about to leave when the phone rang.

I just about left when the phone rang.

I just about left when the phone was ringing.

were buying, costed

bought, costed

had bought, costed

bought, cost

still burnt, arriving

was still burning, arrived

was burning, had arrrived

still burnt, arrived

was

is

had been

became