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  1. #1
    e2e4 is offline Senior Member
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    Default present perfect with once

    Once I heard that...
    Once I've heard that...

    Is it possible to use present perfect with once?

  2. #2
    Kraken's Avatar
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    Default Re: present perfect with once

    I am not a teacher, but I think it depends on the context.

    once
    n. one time, single occurrence

    conj. at the moment that, if ever

    adv. one time; at one point in time; in the past
    So, you should say
    Once I heard that... (in the past)

    Other uses of once would be

    "I will say it only once"
    "Once you start there's no turning back"

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    sarat_106 is offline Key Member
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    Exclamation Re: present perfect with once

    Quote Originally Posted by e2e4 View Post
    Once I heard that...
    Once I've heard that...

    Is it possible to use present perfect with once?
    You can use present perfect if what you heard has relevance to the present. Such as: Once I've heard that crude Petrolium price per barel will touch US$150.

  4. #4
    Raymott's Avatar
    Raymott is offline VIP Member
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    Default Re: present perfect with once

    Quote Originally Posted by e2e4 View Post
    Once I heard that...
    Once I've heard that...

    Is it possible to use present perfect with once?
    Yes you can.
    "Once I've heard the results, I'll tell you" (This has the force of the "When I have heard" i.e. in the future)
    "I've heard that term once before"
    "Once" is a difficult word because it can mean so many things. You can't use it in the sense given in the post immediately above.

  5. #5
    e2e4 is offline Senior Member
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    Default Re: present perfect with once

    Thank you guys!
    You were of great help!

    What I thought maybe it was possible for once isn't definite adverb of time (floating), such as yesterday, last month etc.. but I am not sure about for once takes my thinking to the past immediatelly.

    1) Once I've heard that is possible to use once with the present perfect.
    2) Once I heard that is possible to use once with the present perfect.

    I vote for 2).
    Let me hear about this one exactly and not about the other sentences and uses such as time clauses or so.

    I am (almost) sure it is not possible to use present perfect with

    Once, upon a time,
    Last edited by e2e4; 09-Jul-2008 at 15:31.

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    Raymott's Avatar
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    Default Re: present perfect with once

    Quote Originally Posted by e2e4 View Post
    [...]
    1) Once I've heard that is possible to use once with the present perfect.
    2) Once I heard that is possible to use once with the present perfect.

    I vote for 2).
    Let me hear about this one exactly
    1. is wrong
    2. is right

  7. #7
    e2e4 is offline Senior Member
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    Default Re: present perfect with once

    Now I'm taken back to your the second proposal (example) from your the first post.

    I've heard that term once before.

    So
    I knew present perfect is in use with before.
    I've seen it before. (but nobody know when actually, it's just a simple statement)
    First we must solve out what is before in this sentence?

    preposition, conjuction or adverb of time maybe?
    Last edited by e2e4; 09-Jul-2008 at 16:20.

  8. #8
    Raymott's Avatar
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    Default Re: present perfect with once

    Quote Originally Posted by e2e4 View Post
    I've heard that term once before.
    First we must solve out what is before in this sentence?
    preposition, conjuction or adverb of time maybe?
    I'd call it a preposition, a shortcut meaning "before now",
    but you could argue that it's an adverb. "before now" is
    an adverbial phrase.

  9. #9
    sarat_106 is offline Key Member
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    Exclamation Re: present perfect with once

    Quote Originally Posted by e2e4 View Post
    Thank you guys!
    You were of great help!

    What I thought maybe it was possible for once isn't definite adverb of time (floating), such as yesterday, last month etc.. but I am not sure about for once takes my thinking to the past immediatelly.

    1) Once I've heard that is possible to use once with the present perfect.
    2) Once I heard that is possible to use once with the present perfect.

    I vote for 2).
    Let me hear about this one exactly and not about the other sentences and uses such as time clauses or so.

    I am (almost) sure it is not possible to use present perfect with

    Once, upon a time,
    You are right. Undoubtedly it is a definite adverb of time. According to Wakipedia: Once upon a time is a stock phrase that has been used for many hundreds of years in storytelling in the English language. So the question of using with present perfect does not arise.

  10. #10
    vil is offline VIP Member
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    Default Re: present perfect with once

    I'm not a teacher.

    Hi e2e4,

    On the one hand I know that:

    once = at one time in the past; formerly.
    once = conj. as soon as; if ever; when

    On the other hand there is the following rule in English grammar:

    The Present Perfect is used in adverbial clauses of time after the conjunctions when, till, before, after, as soon as to denote an action completed before a definite moment in the future.

    Don’t buy any more meat to-morrow until you have spoken to the mistress about it.

    I am not going till you have answered me.

    Another point to be considered is that if a virtual memory operating system is to be used, oncethe data tree has reached a certain size (known as the working set limit) variables created early on in the initialization will be written out to disc.

    Once he has identified the extremities of the part he wishes to detail, all the 18 FE6 _ac_tech_engin the movements of the parts between each frame must also be set up.

    Regards

    V.

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