I don't understand why they would say 'Iru?' alone. I thought you needed a
longer sentence for a question.
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2016-08-16T08:16:17.690
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grammar word-choice colloquial-language questions
Why do people say 'Iru?' alone?
いる？ is a colloquial way of asking "Want some?" (or "You there?"). Of course
colloquial speech is free to break the usual grammar rules, but even in
standard Japanese grammar both object and subject are optional, so that
answering いる "I want some" (or "I'm here") would be a complete sentence. The
only part that might be disputable in standard grammar is the omission of the
question particle (usually か, but also の), which has been replaced by the
Western question mark (marking rising intonation).

So no, you don't need a longer sentence for a question, certainly not in
colloquial speech.
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2016-08-16T08:53:10.413
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いる？ comes from 要る which means to want, the subject is inferred to be whomever
the speaker is speaking to.

Person A is eating a cookie from a box of cookies.

Person B is sitting beside her.

* * *

Person A: これめっちゃ美味｛おい｝しい。要る{いる}？ (She offers a cookie to her)

Person B: ううん、ダイエットなんだ。
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answer