Last year ,after he graduated from university,he went to study chinese at PeKing university.

题目

Last year ,after he graduated from university,he went to study chinese at PeKing university.
为什么是过去时,不是过完?

答案

Last year 是过去时间提示词,所以整个句子都跟过去时间有关.又因为主句和从句有先后关系,所以也可以用主句是过去时,而从句是过去完成时.Last year,after he had graduated from university,he went to study Chinese at Peking University.
但是,如果强调他大学一毕业就入北京大学学习汉语,那么就用用主句是过去时,而从句也是过去完成时.Last year,after he graduated from university,he went to study Chinese at Peking University.
后者更加符合我国教育的实际情况.同时也可以写成Last year,after graduating from university,he went to study Chinese at Peking University.