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置いている : Depending on context, this can mean something like present progressive
"being placed" or a completed state "have been placed".

置いてある : This is to refer to the resultant state of the item being placed

置いておく : This is to refer to doing the verb, in this case, placing something as
preparation for the future

**部屋の隅に机を置いています**

In this case, does this sentence mean "A table has been placed at the corner
of the room"?

And if I were to use 置いてある or 置いておく respectively, do they actually mean the
same thing as "A table has been placed at the corner of the room" but with
different nuance mentioned earlier at the start of the post?

To be clear, the verb, 置く, is confusing for me in this sense as I read that
the example sentence I gave could also mean "There is a table at the corner of
the room", if 置いている is used. Does it apply to the other two too?
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2020-04-02T23:43:36.927
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2020-04-03T00:31:56.267
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question
て-form
What are the difference in nuance between 置いている、置いてある、置いておく?
For me,「置いて」is composed of the conjugation(連用形) of「置く」+ 「て」: conjunctive
particle and is combined to [the auxiliary
verbs](https://ja.wikipedia.org/wiki/%E8%A3%9C%E5%8A%A9%E5%8B%95%E8%A9%9E):「いる」,「ある」,「おく」rather
than 「置く→置い」+「ている」,「てある」,「ておく」.

I hope I can clarify the difference between the auxiliary verbs with the
following analysis:

  * 部屋の隅に机を置いています

This sentence says the author places their desk at the corner of the room due
to some reasons such as their layout preference or the corner is only space to
fit in, etc. It's talking about the author results in the **state** of "There
is the desk at the corner" by the action of「置く」rather than mentioning the
action :「置く」having been/being completed.

  * 部屋の隅に机が置いてある

This sentence says the author reports the desk is placed at the corner of the
room. Without some more contexts, what the author wants to focus on is
ambiguous.

  * 部屋の隅に机を置いておく

This sentence says the author is placing the desk at the corner of the room
for some purposes such as making space to invite people to the meeting room,
etc. or leaving the desk alone at the corner of the room in order to vacuum
the area the desk occupies, etc.

Regarding「置いておく」, I think it's bit difficult to distinguish "preparation" and
"leave alone" sometimes and the context makes its meaning clearer.
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answer