when you were sleeping

when you were sleeping Were you sleeping when Tom phoned you? ①called,were,you,when,you,I,sleeping?连词组句 he were sleeping when the UFO arrived.为什么用were We hit the enemy when they were sleeping. when were you there when you were my When were you born? when were you young ‘when you were born. Mary called while you were sleeping.I will________her back i --- you sleeping when i called you?填什么