Affirmative : The sun was setting as we were hiking up the mountain., The students were working on their projects during the class., I was studying when the phone rang., Negative : She wasn't cooking when I entered the kitchen., The students weren't working on their projects during the break., The team wasn't practicing that day due to bad weather., Question : Were you studying when the phone rang?, Was she cooking when the guests arrived?, Were we watching a movie at that time?,

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