помогите пожалуйста сделать предложения отрицательными и вопросительными .1)At this time

1. At this time yesterday i wasn't sitting at the treatre 
2. Yesterday they weren't writing a letter to his friend
3. He wasn't playing in computer games
4. We weren't writing  a composition the whole day yeatsrday
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1. At this time you were sitting at the theatre yesterday?
2. Were they writing a letter to his friend yesterday?
3.  Was he playing in computer games?
4. Were we writing a composition the whole day?