•We use the past simple to talk about an action that happened in the past.
(eg. I walked to work / I didn’t walk to work / Did I walk to work ?)

•We use the past continuous to talk about an action that was happening at a moment in the past.
– Affirmative form : Subject + was/weren’t + verb-ing (eg. I was walking to work.)
– Negative form : Subject + wasn’t / weren’t + verb-ing (eg. I wasn’t walking to work.)
– Question form : Was/were + subject + verb-ing (eg. Was I walking to work ?).