CORRECT: You called me when I was sleeping, I was sleeping when the movie started, I was drinking tea while I was eating a sandwich, The kids were playing while we were making sandwiches for them , The customer was paying when somebody stole his wallet, INCORRECT: We were shopping while I slept, I was doing my homework while I read, Charlie was drinking wine while he cooked, The sun was coming up while I took a shower, The movie was beginning while I bought pop corn , The concert was ending while I got a ticket ,

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