现在完成时的句型结构

问题描述:

现在完成时的句型结构

have/has+动词的过去分词

have/has+done(动词过去分词)

have /has+ done(表示从某个时刻起到现在,刚好完成.翻译时基本上用已经代替)eg: He has been to Beijing for several times.(他去北京已经有若干次了.) You have told me this story tree times since you came b...