Usage Examples Past Simple vs. Past Continuous

• My mother was cooking for five hours on Sunday. -
• While I was walking to the university, I witnessed an accident. -
• I met Elisa when I was going to work. -
• Who did you see at the train station? -
• Who was Alessia talking to when you saw her? -
• My best friend graduated from the university in June. -
• What were they doing when you arrived at the party? -
• I wanted to call my mum but I called you instead. -
• Which shop did Tom go yesterday? -
• Lisa was studying when Joe called her. -
• Which song were you singing when I came in? -
• Where was Rob going when he lost his phone? -
• I was standing in the line when I saw Mary. -
• When I walked into the room, they were dancing. -
• Were you sleeping when everything happened? -
• I broke my leg when I was skiing. -
• We were playing tennis when Alex hurt his wrist. -
• When I woke up, it was snowing. -
• We found the keys we were looking for yesterday. -
• What were you doing at eight o'clock last night? -