to talk about actions or situations that were happening at a particular time in the past - I was still sleeping at 7 am this morning., to express interrupted actions – an activity that was in progress when something else happened - They were watching TV when the phone rang., to show that two or more actions were in progress at the same time - He was writing the report and she was planning the presentation., to give background information about setting in order to make a story more interesting and colourful - The birds were singing when Mary opened the window.,

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