>The verbs "go" and "come" have very similar meanings.
>Are they really indispensable?
>For example if a lang has the following words: - dep = to move - da = to
>(direction) - xi = here - mow = home it would be possible to use "dep da
>xi" for "come here" and "dep da mow" for "go home".
>Are there natlangs which don't use different words for "go" and "come"?

I think that the choice between "go" and "come" were dependant of the
position of someone else

example: I would say "come here" because I am already here. If I were not I
would not only have to change "here" for "there" but also "come" for "go":
"go there"

If I say "I come to you" I should not say "I go to you" because you are at
the place I go

If I say "I go to the museum" and "I come to the museum", the latter let me
suppose that someone else, probably the hearer, is already there (or will
aready be there when I'll arrive)

So I think that when that's an action performed by the one who's talking,
the choice depends of the position of the one to whom he's talking

And when it is performed by the one you're talking to, the choice is
relative to your position

If I say "come to daddy" and "go to daddy", the first implies that I am the
"daddy" and the second, that I'm not.

Don't y'all think that's true?

If that's the case, I think that detail about the position of the one who's
not performing the motion isn't very useful, don't you think?