Statements used as questions in casual speech

Question

I see people say statement as question while speaking by raising their voice at the of it to mean it's a question.

For example consider followings.

1. You want to stay here? ==> Is used to mean "Do you want to stay here?"
2. You guys spoke to anyone? ==> Is used to mean "Did you guys speak to anyone?"

Are these really used by native speaker in casual speech? And can I write them in the same way while writing them as dialogue by putting them between quotes? Are there any special grammar rules for these kind of questions?

Answer 1

Yes, they're really used by native speakers in casual speech.

Yes, you can write them that way in dialogue.

No, there are no special rules. Just write a sentence that is grammatically a statement, then write a question mark at the end instead of a period to signal the rising intonation. (That's what you've done in your examples.)

Answer 2

These are indeed used, but mostly in speech or in quotes.

In speech, inflection plays a major role. There are at least two methods of making these statements seem like questions: 1) Rising tone on the last word and 2) This, combined with emphasis of one word or the other, this was a common import of speakers of Yiddish. Indeed, it can be used to make all sorts of statements.

Him I should want for a brother in law? = he's not good enough!

Him I should want for a brother in law? = he's nice enough, but he's beneath me!

Him I should want for a brother in law? is very similar to Him I should want for a brother in law? and both mean something like "OK, my sister is in love with this shlemiel, I can live with, but she could have done much better

and

Him I should want for a brother in law? = As a business partner, sure! But a relative???

Answer 3

Yes, this is fairly common in casual speech, not so common in formal writing.

Note that often this indicates that the speaker considers the statement surprising. In general, if you were, asking a person if they wanted to remain in their present location, you would use the "by the book" construction, "Do you want to stay here?" But if a person indicated they wanted to remain somewhere that you thought undesirable, like some place uncomfortable, or if you expected that they would want to leave, perhaps you thought they were in a hurry to move on, then when the person says, "No, I think I'll stay," you might reply in surprise, "You want to stay here?"

It is used as an alternative to a question in very informal speech. Instead of, "Would you like to stay here, sir?" one might ask, "Ya wanna stay here, bud?" This is especially true as the construction of the sentence becomes more complex. "You guys spoke to anyone?" is not unlikely, because the more formal statement would be, "Have you gentlemen spoken to anyone?", which is several levels higher in formality.