急、 英语 My parents ____ （teach）English in this school since they came to Najing.My parents ____ （teach）English in this school since they came to Najing.答案应该是have been teaching,但是我写的是have taught请说明下理由、

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急、 英语 My parents ____ （teach）English in this school since they came to Najing.My parents ____ （teach）English in this school since they came to Najing.答案应该是have been teaching,但是我写的是have taught请说明下理由、
急、 英语 My parents ____ （teach）English in this school since they came to Najing.
My parents ____ （teach）English in this school since they came to Najing.
答案应该是have been teaching,但是我写的是have taught
请说明下理由、

急、 英语 My parents ____ （teach）English in this school since they came to Najing.My parents ____ （teach）English in this school since they came to Najing.答案应该是have been teaching,但是我写的是have taught请说明下理由、
先翻译一下.
我的父母在这个学校教英语自从他们来到南京.
have taught 没有语法错误.since+时间段用现在完成时.
而后者为现在完成进行时,表示动作从过去现在还在进行,并将持续下去.
也就是说我的父母一直在这个学校教英语自从他们来到南京.
注意一下两个时态的特点：
某个动作,发生在过去,具体什么时候不知道,但到目前为止,是做过了的,这就是现在完成时.
某个动作,过去就已经发生,而且到了现在还没有中止,还在做,这就是现在完成进行时.
你比较一下例句：
I have phoned him.
She has been talking on the phone for three hours.
第一句是说,我打过电话了,注意这个句子是不提供具体时间信息的,仅仅是,至今,我做过这件事了.
第二句话,她一直在打电话,至现在已经打了三个小时,还没停.
你想想看,如果这两个时态的区别是什么动词延续或短暂,又怎么触及“是否还在进行”的本质呢?短暂的动作也好,延续的动作也好,在时间划分上都可以是一直进行的.He has gone,这样的句子,go是延续性动词还是短暂性动词呢?“走”既可以看作是瞬间就发生,也可以看成是长时间的动作,所以动词含义只是表象.这两个时态的本质区别,就是后者表述动作还在进行,进行态的意思就是“一直”“经常”.
在看看所谓的互换.
如果She has been talking on the phone for three hours.
那么你可以推出She has talked on the phone for three hours.
但是你能反推吗?
所以,你的“某些时候”可以互换不周延.这个要看具体的逻辑.
你在看看这个例子,拓展一下：
很多语法书都说,现在完成时表示动作对现在造成的影响,因此：
He has gone to America.
如果“对现在造成影响”,我们是否可以判断：“He is not in China”.
或许他已经回来了,但是说话人不知道,那么死扣这种“语法规则”,能得到事实吗?

have taught 是现在完成时，表示动作从过去到现在为止完成了，不再持续。
have been teaching 是现在完成进行时，表示动作从过去现在还在进行，并将持续下去。

have taught-------------现在完成，不教了
have been teaching----------------------------现在完成进行，教了很多年，还在教。

这里用的是have been teaching，表示他们来到Najing以后一直在这所学校教英语，since引导的时间状语表示一段时间，所以应该用have been teaching。

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