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I am very confused about the meaning of the expressions 'ていく' and 'てくる' and
seems that every website I look has a different explanation.

Translations that I think are good:  
_'Go in order to buy wine';  
'Going to buy wine';  
'Buy a bottle of wine and then go'._  
Which one is right and why?
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2017-02-24T22:45:38.373
43837
2022-01-06T01:14:46.607
2022-01-06T01:14:46.607
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question
grammar verbs て-form subsidiary-verbs
What does ワインを買っていくよ mean?
The ていく and てくる forms can express many different things. If you can imagine a
timeline from past -> present -> future, てくる (てきた can be considered present
perfect tense) will usually describe actions that have occurred prior to the
present moment, whereas ていく will describe actions that will occur moving
forward.

Also, whether you use ていく or てくる will depend on whether the thing/person that
is moving is approaching or leaving the speaker.

Another concept that is expressed by てくる・ていく, is to, according to my grammar
dictionary, "Do something and then move on." Without knowing the larger
context around the sentence you provided, it's hard to say for sure, but
ワインを買っていく could imply that the speaker is going to buy wine, and then go
somewhere else or do something else. Whereas if they said ワインを買ってくる, it would
mean that they were going out to buy wine and then return.
CC BY-SA 3.0
2017-02-25T01:00:00.683
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2017-02-25T01:00:00.683
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answer
> ワインを買っていく

literally means "I'll buy wine and go". You'd say this to mean "I'll buy wine
on my way to the place where you are (≂ I'll buy wine and bring it to the
place where you are)", "I'll buy wine on my way to somewhere (away from the
hearer) (≂ I'll buy wine and bring it to somewhere (away from the hearer))",
or "I'll buy wine here(, and leave this place)."

Compare:

> ワインを買いに行く "I'll go (somewhere) to buy wine."
>
> ワインを買ってくる "I'll buy wine (somewhere) and come back (here; to the place where
> the speaker is now)."
CC BY-SA 4.0
2017-02-25T01:02:13.177
43842
2020-07-30T14:45:49.163
2020-07-30T14:45:49.163
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answer