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We have a question on this site, [What is the _proper_ differentiation between
来る and 行く?](https://japanese.stackexchange.com/questions/1669/what-is-the-
proper-differentiation-between-%e6%9d%a5%e3%82%8b-and-%e8%a1%8c%e3%81%8f),
which does seem to correctly explain the basic general differentiation between
行く and 来る, which is that it is chosen based on the speaker's perspective
(regardless of sentence subject, etc.).

However, this is what still confuses me: **Physical location of speaker at
speech time is not what determines the verb.**

If you are at school and you invite your friend over to your house, you say
「うち来る？」, not 「うち行く？」, right? If you live in Japan but you're visiting America
and invite your American friend to Japan, you say 「日本来る？」 right? (Although, if
you're just asking if they will go to Japan at all, not to visit you or
something like that, it's 「日本行くの？」, yeah?)

I can imagine two ways to account for this: 1. it's the speaker's location _at
the time of movement_ that's relevant, not their current location, or 2. it's
the speaker's "ownership" of the location that's relevant (which I think
accounts for the 日本来る・日本行く difference in nuance pretty well).

I think it's two, but physically being somewhere gives you a sense of
ownership over the location?

「パーティー来る？」 is okay to say even if it's not your party, but you just happen to
already be there, right? 「彼は一週間前ここに来たみたい。」 is fine, even if where you are is
totally not yours, yeah?

How about being physically somewhere at movement time?
「俺は１時から５時まで太郎の家にいるから、その間に来るよね？」 seems like it could be okay, but I think 行く is
at least also is fine here...

But if course, it's not just physical location at speech time, or physical
location at movement time, because 「私がいない間うちに来たのよ…」 works even if you're not
at home.

Yet, if you use 一緒に, then you must use 行く 「一緒にうちまで行く？」 I think, even if it's
yours...

Is there some simple explanation which accounts for all this (assuming my
judgments are correct, and I'm not too sure about them to say the least)?
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word-choice verbs
How do 行く and 来る *really* work?
Not only the choice between 行{い}く and 来{く}る, but all the events need to be
described based on the speaker's perspective. So, the physical presence of the
speaker doesn't matter. Although, the choice of the verbs 行{い}く and 来{く}る
represents the place the speaker focuses on.

> 行{い}く
>
> **the point of starting [A]** --------> somewhere [B]
>
> 来{く}る
>
> somewhere [A] --------> **the point of arrival [B]**

Both 行{い}く & 来{く}る indicates the movement from A to B. 行{い}く is used when the
speaker concentrates on where the action starts. On the other hand, 来{く}る is
used when the speaker concentrates on the point of arrival.

> A: I'm **going** to the library.
>
> B: Can I **come** , too?
>
> A: 図書館{としょかん}に **行{い}きます** 。
>
> B: 私{わたし}も **行{い}って** いいですか。

行{い}く indicates that someone or something leaves from the point where the
person or the thing is, whoever the doer of the verb is. But 来{く}る normally
indicates that someone or something arrives to the speaker or the place the
speaker belongs to. So, 来{く}る cannot be used for the sentence B in the
example.

> If you are at school and you invite your friend over to your house,
>
> ○ うちに来{く}る？
>
> ? うちに行{い}く？

The owner of うち is usually the speaker unless it's pointed out as 〜さんのうち or
うちに帰{かえ}る (帰{かえ}る is only used when the point of arrival is where the doer
belongs). So, in this case, 来{く}る is normally used. Although, 行{い}く could be
used if you want to suggest your friend to go to your house together, such as
うちに行{い}かない？ or うちに行{い}こう. うちに行{い}く？ sounds like you won't be home when your
friend comes or うち is not yours but someone else's.

> 一緒{いっしょ}にうちまで行{い}く？

This is fine when you are sure to head to your place with your friend.

> If you live in Japan but you're visiting America and invite your American
> friend to Japan

In this case, I would say,

> 日本{にほん}に来{こ}ない？

Using 来{く}る is right because you concentrate on the point of arrival 日本{にほん}.
But 日本{にほん}に来{く}る？ sounds as you ask your friend if s/he would come or not
like 'Will you come to Japan?'. 日本{にほん}行{い}くの？ sounds unnatural in this case
but could be used when you don't live in Japan and want to know if your friend
goes there or not.

> パーティーに来{く}る？

You can use 来{く}る, even you are not the organizer of the party, as long as you
very sure to participate in it. If you're unsure about your participation,
行{い}く should be used.

> 彼{かれ}は一週間{いっしゅうかん}前{まえ}ここに来{き}たみたい。

Yes, this is fine if you are at right in the place he visited. The place
doesn't necessarily need to be yours. If you use 行{い}った instead, you are
probably talking about where he visited while looking at the map.

> 俺{おれ}は１時{じ}から５時{じ}まで太郎{たろう}の家{いえ}にいるから、その間{あいだ}に来{く}るよね？

Since 来{く}る is used, the speaker is asking if the listener is coming to
太郎{たろう}の家{いえ} where he will be. 行{い}く can be used when the speaker wants to
ask if the listener visit somewhere else but 太郎{たろう}の家{いえ}.
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answer
くる means one approaches to the point of view while 行く means one goes away from
it. It depends on where you put the point of view to choose which to use.

In the scene where you invite your friend to your house, it depends on which
you feel psychologically closer to between your friend and your house. If it's
the former, you use 行く, otherwise 来る. I think the example of 一緒に行く supports
that idea.

In that sense, 「俺は１時から５時まで太郎の家にいるから、その間に **行く** よね？」is confusing in the point
that you are seeing yourself from the opponent viewpoint. However, it's not
that such expressions are impossible. You may use it when you want to fix the
point of view, for example, when a detective lists what someone did.
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My first inclination is to say that it really is not either 1 or 2, but
instead:

行く indicates that somebody is moving away from where the speaker is now or
_will be at the time of departure_.  
来る indicates that somebody is moving towards where the speaker is now or _will
be at the time of arrival_.

Therefore something like「うち来る？」says basically "Will you go to my house? If so,
I'm planning on also being there when you arrive." while 「うち行く？」says "Will you
go to my house? If so, you will need to leave here in order to go there."

Note that in the case where the speaker is also moving during that time, there
can be some overlap between these two scenarios. In those situations,
whichever one is used can depend on which aspect of the journey (leaving or
arriving) the speaker wants to focus on more.

But for example, regardless of ownership, I would not expect someone to
say「うち来る？」if they were not actually intending to also be there at the same
time that the listener was.

(FWIW, I think there is also some element of intent present in all of this as
well. For example, 来る can also indicate that somebody is going to some
location _with the intent of becoming closer to where the speaker is or will
be_ , whether that actually works out to be the case in reality or not.)
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