when di you go to bed last night?"转化为间接引语father said to anne.Father asked Anne when she went to bed the night before为什么在

when di you go to bed last night?"转化为间接引语father said to anne.Father asked Anne when she went to bed the night before为什么在间接引语中,时态没有发生变化,如果变为过去完成时是否正确?.