brian toid you that there wasn't anyone in the room at that time,________?

brian  toid  you  that  there  wasn't anyone in the room at that time,________?

怎么不用don't he 要解释,为什么不是否定后移
“Brian told”人称为第三人称,后面的疑问句与主句相数游一致,且主句的时态是过去时等等,疑问句应和主句的人敬毕敏称时态保亮枝持一致。
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