Question:
Question: What kind of preposition should I use OR each of them is acceptable for different cases?
IN or/and INTO or/and '_'
He turned into the red color
He turned in the red color
He turned red
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Question: What kind of preposition should I use OR each of them is acceptable for different cases?
IN or/and INTO or/and '_'
He turned into the red color
He turned in the red color
He turned red
He turned red.
We usually don't say "the red color" when we just mean "red". Slavic languages tend to do this, as in красный цвет.
In some cases, however, we might use it to mean "a particular shade of red":
When he became angry, he often turned a red color which reminded me of cherry tomatoes. It usually took five minutes after he'd calmed down before the red color went away.
Note that this isn't red in general, but a certain red.
Also, since "turn" is used as a copula verb, we don't need any preposition. Here are some examples of copula verb sentences, starting with one about color:
I was afraid to eat the cheese because it had turned greenish-blue.
She was so frightened that she looked white.
When she learned that Bob was now dating Shirley, she became green with envy.
("Green with envy" is a common metaphor.)
The sky looks dark gray.
The most common way of phrasing this would be option 3:
He turned red
The phrase turned into is usually used to indicate a wholesale transformation of something, for example:
He turned into a dragon
or
As spring turned into summer ...
You therefore can say He turned into the colour red. People would probably understand what you meant, but it would be an unusual way of phrasing it and people might think that "he" had transformed into an abstract concept, "the colour red". As Epanoui has already said, the red colour would not be used in this context, but the colour red can be.
(As a side note, turned into can also be used to describe someone who is travelling, to say that they went into a particular place, e.g. "He turned into the driveway". For this case, however, you might want to split up "into" to be "in to" so it doesn't sound like you're saying that they transformed themselves into the driveway...)
The phrase turned in has a different meaning to the one you want. It either means:
to go to bed:
He turned in for the night.
Or to give something to someone:
He turned in his exam paper.