1

Could you please tell me whether the question is grammatical?

Which of the phrases sound natural?

Don't we need to use auxiliary verb do/does here to form a question?

2

Subject and verb disagree here. The verb needs to agree with the singular "which", not the plural "phrases". Therefore:

Which of the phrases sounds natural?

We can consider these similar sentences to help us understand:

Which phrase sounds natural?

Which phrase among the ones here sounds natural?

and not: "Which phrase sound natural?"

Don't we need to use auxiliary verb do/does here to form a question?

It's not necessary, and I don't think there is a rephrasal which means the same thing.

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0

I think, in itself, the sentence you cited would be ungrammatical for it would be counted as a subordinate clause. I think the right version would be:

Which of the phrases does sound natural?

Let's say your friend asked you that and you are describing what he asked to any other person, then would you be using what you cited. For instance:

My friend asks me which of the phrases sounds natural.

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  • 1
    Thank you for the answer. I'm still a little bit unsure about the correctness of the question "Which of the phrases does sound natural?" It looks a little unusual to me... – embedc May 6 '19 at 15:13
  • For more clarification, I really want you to have a look at this thread of a related answer - english.stackexchange.com/questions/286172/… – Kelvin May 6 '19 at 15:30

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