作业帮现在完成时的句型结构
来源：学生作业帮 编辑：拍题作业网作业帮 分类：英语作业 时间：2024/04/28 02:25:54
现在完成时的句型结构
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 back last night.(自从昨天晚上你回来起,你已经对我讲了3遍这个故事)
I haven't seen our dog since yesterday.(我从昨天起就没见过我们的狗)
一般来讲,完成时太常跟already,yet,since for+时间等词用在一起.
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 back last night.(自从昨天晚上你回来起,你已经对我讲了3遍这个故事)
I haven't seen our dog since yesterday.(我从昨天起就没见过我们的狗)
一般来讲,完成时太常跟already,yet,since for+时间等词用在一起.