that describes an ongoing action in the past, often interrupted by another event. • E.g. Klara was playing basketball. • E.g. We were watching a movie.
past continuous with the past simple. The past continuous talks about a longer action which started first. • E.g. We were walking home when we saw a bag of rubbish. • The past simple talks about a short action which happened during the longer action. • E.g. we were walking home when we saw a bag of rubbish.
the past continuous or the past simple part of the sentence into a question. We use matching short answer. • E.g. Were you walking home when you saw a bag of rubbish? • Yes, we were. • E.g. When you were walking home, did you see a bag of rubbish? • Yes, we did.