I'm trying to repair the bell,' answered Bill.' I've been coming up here night after night for week新概念第三册,第二课 I've been coming up here night after night for weeks now. I have been coming up 用的是现在完成式吗?为什么不

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I'm trying to repair the bell,' answered Bill.' I've been coming up here night after night for week新概念第三册,第二课 I've been coming up here night after night for weeks now. I have been coming up 用的是现在完成式吗?为什么不
I'm trying to repair the bell,' answered Bill.' I've been coming up here night after night for week
新概念第三册,第二课 I've been coming up here night after night for weeks now.
I have been coming up 用的是现在完成式吗?为什么不用,I have come up,
还有,不明白,for weeks now, 为什么这几个单词拼在一起

I'm trying to repair the bell,' answered Bill.' I've been coming up here night after night for week新概念第三册,第二课 I've been coming up here night after night for weeks now. I have been coming up 用的是现在完成式吗?为什么不
用的现在完成进行时,表示一个动作从过去一直持续到现在还有可能持续到将来,例如 I have been waiting for you for hours now. for hours表示等人这个动作已经持续了几个小时了,now则表示到目前为止

我正在尽力维修这个时钟,比尔回答道,我这周每天夜里都会来这里修钟
因为他现在正在修钟,为了强调现在的进行时态,以及之前的完成时态,所以采用了现在完成时,have been强调现在的进行时态

过去完成进行时,表示过去到现在一直在做,for weeks now表示到现在已经好几周了