I was studying when the phone rang.She was sleeping when the alarm clock went off.They were walking to school when it started raining.He was cooking dinner when the power went out.We were watching a movie when the fire alarm went off.She was talking on the phone when her mother walked in.They were playing soccer when it started to thunder.He was driving to work when he got a flat tire.We were waiting for the bus when it finally arrived.She was reading a book when her friend called.