None of the students (understand)what he (say)did they
问题描述:
None of the students (understand)what he (say)did they
答
None of the sutdents understood what he said, did they?
答
None of the students understood what he said, did they?
答
None of the students understood what he said,did they?
一般来讲none of +人即使人用复数形式,其后面的谓语动词也一定用单数.但在此句中,后面用来表达反义疑问的did they,表明了此句的时态为过去时,从而被反义疑问的understand即应用过去时understood,同样understand的内容是“他说的”也是已经说过的,所以也用过去式.