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I'd like to know what"you've seen yesterday" means in this context:

If you can talk with your friend who you haven't seen for a long time as if you've seen her/him yesterday, you're best friends.

I thought we can't use "have seen" with "yesterday" because this "have" means experience.

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    Do you have a link to where you saw this sentence? Some stuff is just slang, like 'I haven't seen you in a minute', which means 'I haven't seen you in a long time'. – Alan Carmack Apr 13 '16 at 23:54
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Short answer: Native usage on this point (at least in the US) is quite a bit looser than what prescriptive grammar books teach you.

In this particular case, the emphasis is on the fact that (hypothetically) you've seen your friend, that such an action has occurred. But, because the proximity is important, the completed task is not "seeing your friend" but "seeing your friend yesterday."

The specific point in time is secondary; we don't really care that it was at 9:00 or 17:00 or whenever yesterday. And, if you can think about it figuratively, it doesn't matter that it was specifically yesterday versus last Friday or a week ago or whenever. Yesterday here isn't to designate a specific time, just to imply proximity, almost like a synonym for recently.

This usage largely results from the fact that the example is hypothetical--it's the hypothetical nature that leads the speaker to not think of yesterday as a specific point in time. The indicative version, You've seen your friend yesterday sounds fairly unnatural, albeit not totally ungrammatical. It places the emphasis on the accomplishment of having seen your friend, and again, mentions yesterday almost as an afterthought.

That's the best explanation I can give as a native speaker--the given example doesn't sound odd to me at all. I know blaming prescriptive vs. descriptive grammar is a not very satisfying answer, but it's my best attempt to explain the psychology going on in this choice of tense.

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    Exactly, and recently and even yesterday works if these time periods are considered still part of present time (not yet in the past). Recently I've parked in Lot A, but today I parked in Lot B. – Alan Carmack Apr 13 '16 at 20:34
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This explanation is from the link attached below..

For example, saying “I have seen the movie yesterday” would be incorrect. The verb form is being used correctly (“have seen”), but the word “yesterday” refers to a specific moment in the past–it does not connect the past to the present..


So from above, I think you should be using had instead of have or replace the word yesterday with before.
You have seen them before or You had seen them yesterday, both would be correct.
Read more here.

  • I think the sentence is fine, actually. – snailboat Apr 18 '16 at 8:40
  • it may be. But after reading this and this,I felt it may be incorrect to use have seen.. – Bee Apr 20 '16 at 10:58
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Present Perfect is a present tense - it describes the present state of something, as being connected to something completed (perfect).

Think about "your friend who(m) you haven't seen for a long time" as a description of present state of things.

In this sentence, you could think of "you've seen her/him yesterday" as an alternative state of things. "As if" connects these two alternatives.

This sentence can also be regarded as an idiom that would be weakened if the second part used past simple instead.

"You've seen her/him yesterday", by itself, does not clearly describe a present state, since it mainly indicates the time of the past "seeing". If that time is the focus of the sentence, then past simple should be used.

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    This is just my intuition, but my inference was that OP was trying to understand usage by a native speaker "in the wild," not trying to compose a more grammatical sentence. – CynicallyNaive Apr 14 '16 at 18:56
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    I think the sentence given is very clear, so this is not a question about meaning. OP is practically asking "why is present perfect used here", and my answer addressed that. I didn't suggest any grammar problem. Why "in the wild"? the sentence seems idiomatic to me, and it seems like its wording was carefully chosen. – laugh Apr 18 '16 at 4:48
  • Apologies. My comment may have been misdirected to someone else and wrongly posted on your answer. (Not sure what I was thinking.) "In the wild"--just meaning, an example taken from actual usage by native speakers, not the somewhat artificial world of prescriptive grammar. – CynicallyNaive Apr 20 '16 at 18:48
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The difference between I saw (Past Simple) and I have seen (Present perfect simple) is that for present perfect simple there has to be some lasting effect.

I saw James in the park - no lasting effect

Have you seen John? - lasting effect if true... after seeing him, you would know that he is around

I have seen a doctor, and he told me... - lasting effect- the doctor told you something.

In your sentence, the point you are making is that talking to your best friend is like talking to somebody else (not your best friend) that you had seen yesterday. Seeing the not-best-friend yesterday would make it easier to talk to then today- it would have had some lasting effect, so it's appropriate to use Present Perfect Simple- "as if I had seen him yesterday".

Note that as if is a hypothetical situation, so you should really say "you had seen". See here for a discussion of this point.

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-Have you been to the market yet? -Yes, I have. – When did you go there? – Yesterday.

When recent news is introduced we use present perfect. For details we use past simple. They say it's unusual to have present perfect with expressions of finished time.It is unusual but not impossible. They often occur in news items (announcing the news and giving details in th same clause ).

A 24-year-old soldier has been killed in a road accident last night.

The second version is:

"In spoken and written journalistic styles, the present perfect is sometimes used to stress the current relevance of events, even though definite past time adjuncts may be present."(Cambridge Grammar of English).

  • @AlanCarmack. I want to show you that even traditional grammar recognizes such situations and tries to explain them as "current events ".If it can be heard in news it's possible in speech. – V.V. Apr 17 '16 at 15:16
  • As an aside, my observation is that past perfect such as A 24-year-old soldier has been killed in a road accident last night in the news would be much more common in the UK than in the US. Also UK news reports seem to use the future perfect quite a bit to refer to speculation: The Labour leadership will not have been pleased to hear the results of the exit poll. – CynicallyNaive Apr 21 '16 at 20:33

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