Question

I lived in Patna, when you_______(live) in Delhi.​

Answer 1

I lived in Patna, when you were living/ lived in Delhi.​

• The sentence in the question depicts an event which too place in the past hence past tense will be used to fill in the blank.
• As the other person used to live in Delhi hence, the past form of the verb 'live' will be used.
• We can use either the past or the past continuous tense to fill in the blank.