simon thought his computer was broken until his little brother pointed out that he had forgotten
问题描述：
simon thought his computer was broken until his little brother pointed out that he had forgotten
主句为什么不用过去完成时,因为simon thought这个动作发生在his little brother pointed out 之前
答
simon thought是主句里面的主语和谓语,his computer was broken是宾语从句, until his little brother pointed out .是时间状语从句,这个时间状语从句又带了一个宾语从句.until引导时间状语从句时,主句不用过去完成...