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I told my son we are leaving in ten minutes and asked him to get dressed.

After ten minutes, I ask him:

A: "Did you change your shirt?"

B: "Did you get dressed?"

C: "Have you change your shirt?"

I am a bit confuse the use of did and have.

In the context above, I am going to ask him is he already change the shirt.

Which is the correct question?

  • 1
    All are fine, but remember it's "have you changed". That is the correct "perfect tense" conjugation of "to change" -- I change / I changed / I have changed. – Andrew Aug 22 '17 at 5:22
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In your case the best answer is C. Notice that ed is missing —"have you changed"— because the action finished in the past in a period of time up to now. You mean he changed the shirt and still wearing it. In A, "did you change the shirt?", he may have changed the shirt; that does not mean that he is wearing it now.

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I think there's a very subtle difference between (A) and (C) in that with (A), the speaker is more interested in when the action took place:

Have you been to your room? Did you change your shirt?

is asking whether you changed your shirt while you were in your room, whereas

Have you been to your room? Have you changed your shirt?

is asking two independent questions.

But both are correct.

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