when: He was studying at the library ___ his phone suddenly rang., She was sleeping ___ the alarm clock went off., They were chatting online ___ the internet connection crashed., I was walking my dog ___ it started to rain., We were having a barbecue ___ the power went out., while: She was cooking dinner ___ her husband was setting the table, They were playing cards ___ waiting for the train, He was fixing the car ___ his friend was fetching tools from the garage., I was reading a book ___ waiting for my appointment., We were swimming in the pool ___ the sun was setting.,

Past Progressive using WHEN and WHILE

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