Why is he often late for school? 答案:(Did) you know why he often(had been late for school) ?后一个空格为什么不能填 lated for school? Who were you talking to? 答案:I (did not)know who (you had been talked to).后一个空格为什么不能填were talking to?
1. late不是动词,何来的过去式lated,用was late for school还差不多。 此题之所以用过去完成时had been late,是因为主句中的did. 即主句谓语使用过去时,根据句意he be late for school是发生在主句谓语动词know之前的,即为“过去的过去”,所以从句使用过去完成时。
2. 答案应该是:you had been talking to(即过去完成进行时)。 此答案强调talk动作在didn't know该动作之前一直进行,并延续到didn't know这一动作所发生的时间,这就是过去完成进行时的语法特征。 如果用were talking to也可以,只是它只强调过去某一时间正在进行的动作,没有强调该动作在过去这一时间之前一直都在进行。