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  1. Newbie
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    #1

    Question Please check my understanding of simple past/present perfect after "since"?

    Hi, dear teachers.
    This is what another native speaker told me:
    10. He has been in poor health since he smoked some Djarum Blacks.
    11. He has been in poor health since he has smoked Djarum Blacks. - sounds odd but might be viable
    12. He has been in poor health since he has been smoking Djarum Blacks. could be viable but I'd prefer "started smoking DBs"

    I think using present perfect or present perfect continuous after "since" causes ambiguity in meaning so we shouldn't use the two tenses in since-clause. Now I am going to share my newly learned knowledge from another thread with you, by explaining why using those two tenses are not good English. I really hope you could check my understanding.

    I have learned some knowledge from this thread:
    http://forum.wordreference.com/threa...ondon.3162623/

    According to that thread, "since + simple past(durative verb)" is interpretable, even if it might be wrong(please tell me whether it is really wrong or not). The structure seems to suggest that "something has happened after another thing stopped happening". For example, "I haven't heard from her since she lived in London." This sentence means "I haven't heard from her after she moved away from London". As with example sentence10, it seems to mean that "After he quit smoking some Djarum Blacks, he has been in poor health"

    Besides, according to that thread, the reason why using present perfect or present perfect continuous in since-clause causes ambiguity is that a sentence in either tense is about two times: (1) something that has happened in the past described an event or a state which was the case in the past. In other word, the viewer looks at that event or state, which was completed in the past and its effect doesn't extend up until now, from a past perspective. (2) The viewer looks at that event, which has been done in the past and its effect extends up until now, from a contemporary perspective. Because both tenses have these two properties, "since + present perfect (continuous)" can be interpreted in two ways. One is "After the thing began to happen". The other is "After the thing stopped happening".

    To conclude, although this structure "... since + simple past/present perfect (continuous)" is grammatically possible, we should avoid using it because it causes ambiguity.

    Would you please check my understanding?
    Thank you for your patience.

  2. teechar's Avatar
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    #2

    Re: Please check my understanding of simple past/present perfect after "since"?

    Quote Originally Posted by zuotengdazuo View Post

    To conclude, although this structure "... since +
    simple past/present perfect (continuous)" is grammatically possible, we should avoid using it because it causes ambiguity.
    Did you mean the "present perfect simple" instead of the "simple past" in the above?

  3. Newbie
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    #3

    Re: Please check my understanding of simple past/present perfect after "since"?

    Are "present perfect simple" and "present perfect" identical?
    If they are, then I meant "simple past", not "present perfect simple".
    Last edited by zuotengdazuo; 02-Jan-2017 at 13:09. Reason: typo

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    #4

    Re: Please check my understanding of simple past/present perfect after "since"?

    Write ...explaining why using those two tenses is are not good English.
    I am not a teacher.

  5. Matthew Wai's Avatar
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    #5

    Re: Please check my understanding of simple past/present perfect after "since"?

    Quote Originally Posted by zuotengdazuo View Post
    For example, "I haven't heard from her since she lived in London." This sentence means "I haven't heard from her after she moved away from London".
    I would write 'I haven't heard from her since she moved away from London'.
    I am not a teacher.

  6. teechar's Avatar
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    #6

    Re: Please check my understanding of simple past/present perfect after "since"?

    I've read the OP a couple of times and I still find it confusing. Try posting one sentence at a time and explain what you suspect might be problematic with it.

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