I have been up since two hours ago.为什么这句话是对的?现在完成时不是不能跟过

来源：学生作业帮编辑：搜搜考试网作业帮分类：英语作业时间：2024/06/16 18:18:40

I have been up since two hours ago.为什么这句话是对的?现在完成时不是不能跟过
不是不能跟过去的时间连用吗?

在这里since two hours ago,有了since这个词,since two hours ago就表示一段时间.懂了吗?
再问：不是for才跟一段时间的吗？那麻烦说说跟since的区别/
再答： for+一段时间, since+时间起点(具体过去时间,如:1999; last+时间; 一段时间+ ago;一般过去时从句). 如: I have been here for over 10 years. I have been here since 10 years ago/I came here
再问：那你能解释一下下面是怎么回事吗?现在完成时不能和表示过去的时间连用，如yesterday,last year,two days ago,just now,in 1976
再答：现在完成时表示从过去一直到现在完成的动作，当然不能和过去连用了。

I have been up since two hours ago.为什么这句话是对的?现在完成时不是不能跟过 Lin Tao has been a teacher ()答案是since two years ago 为什么不能是si they have been here ___ two hours ago.A.for B.since C.before I have waited for them （since three hours ago）.对括号里的内容提问 have been to是延续性动词吗?如果不是,那么在现在完成时里这句话里有since,能用have been to吗 have been to是延续性动词吗?如果不是,那么在现在完成时里这句话里有since能用have been "two years ago "不是表过去时吗?为什么可以与现在完成时连用?(since two years ago)而 I have been reading the interesting book (since two days ago I have met him often since I have lived here.这句话对吗?不是现在完成时中s 用“since two weeks ago的现在完成时造句”要汉语 I have been busy since yesterday.现在完成时是have加过去分词,但这里的过去分词在哪里 I have been here since 1976 这里的have 是实意动词吗?那么在现在完成时中是不是没有助动词