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It's +一段时间+since sb. last did sth. 某人不做某事多久了 这里的did 动词的词性有何限

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It's +一段时间+since sb. last did sth. 某人不做某事多久了 这里的did 动词的词性有何限制吗?
做延续性动词是直接翻译还是?做瞬时性动词呢?
接下来这种句子又该怎么翻?
I haven't heard from him since I lived in Beijing.
It's +一段时间+since sb.last did sth.某人不做某事多久了 did必须是延续性动词.如果是瞬间动词,就翻译成,从这个动作开始到现在多长时间了
比如 it is 1 year since he smoked.就是他戒烟一年了.
it is 1 year since he started smoking.他已经抽了一年的烟了
I haven't heard from him since I lived in Beijing.是自从我住在北京就一直没收到他的信.
再问： did 是瞬间动作吧
再答： did在这里只是一个代号，就像like to do你能说只能用do这个动词吗？ did在这个句式里就是代表一般过去时里动词的过去式。动词有瞬间也有可延续
再问： 您那句翻译I haven't heard from him since I lived in Beijing 应该是自从离开北京吧>??
再答： 不是的，It's +一段时间+since sb. last did sth. 某人不做某事多久了 did必须是延续性动词。如果是瞬间动词，就翻译成，从这个动作开始到现在多长时间了 只有在这个句式里才有这个rule，其他的句式没有。 如果是自从离开没收到信还是要说 I haven't heard from him since I left Beijing
再问： live是延续性动词吧？？？
再答： live是延续性动词
It's +一段时间+since sb. last did sth. 某人不做某事多久了 这里的did 动词的词性有何限 英语老师说：It is time that sb did sth.该是某人做某事的时候了. it is (high) time (that) sb.did sth 是某人做某事的时候了 是某人干某事的时间了用英语怎么说?It's time sb.to do sth. 使某人想起某事的英语词组,有remind sb of sth、sth come to sth 、it occurs to cheat 的用法欺骗某人不做某事怎么说?是cheat sb out doing sth.还是cheat sb out bother后跟动词的形式.bother sb doing sth.打扰某人做某事.(某人在做某事,打扰了他)bothe it's time that sb did sth,it's time that sb should do sth有没有 let's 的用法let's=let us意为让我们,后接________(词性) 让某人（sb)做某事(sth)___ 英语翻译比如看到某人做了某事-see sb.do sth.希望某人做某事-hope sb.do sth.享受大自然的美- 英语提问：sb.stated to have done sth. 某人声称已经做了某事.有这样的句型吗? 句型:It's take sb.do sth 还是It's take sb.to do sth?某人花费什么做某事