I've tried searching for the answer in a lot of place. But all I get is formal
answers (like **彼女はいつ来ますか** ). I'm assuming that the informal style will be
**彼女はいつ来てるのか。** because the verb **come** turned into **coming** and is acting
like a noun so, I added a **の** at the end of it. Is it correct? Google
translate doesn't do a good job with informal styles. So can anybody say how a
native Japanese a boy would say this to his high school friend? This will give
me ideas to apply this to a lot of other places. Thank you so much in advance.
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english-to-japanese nouns pronouns informal
Can I use verb as noun in a informal way? Informal Japanese
The informal version of "彼女はいつ来ますか？" is "彼女はいつ来るの？"

  * "のか？" is a literary style, and it almost never happens in ordinary conversations in the real world.
  * `BE + -ING` (eg "She is coming tomorrow") is an **English** way of expressing future tense. Japanese ている doesn't have such a function.

See: <https://www.wasabi-jpn.com/japanese-grammar/question-markers/>

(By the way, if you want to make it really natural, don't use 彼女. An average
Japanese boy doesn't use it more than once a month.)
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2021-02-14T09:01:56.093
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I'd say 彼女はいつ来るの? Just adding の right after the base form of verb works. This
rule can be applied to other verbs like 戻る, 帰る, and so on.

However, Japanese don't use 彼女, 彼 or 私たち so often. I actually pictured myself
speaking and figured out that it would be more natural if we omit subjectives
or specify persons' names. e.g. いつ来るの?, Mary はいつ来るの?
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