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Which is correct?

I would like to know when the delivery day is?

or

I would like to know when is the delivery day?

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1 Answer 1

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I would like to know when the delivery day is is not a question, so it doesn't have a question mark.

When is the delivery day? is a question, and I'd like to know: when is the delivery day? includes that question, but notice the punctuation. Without punctuation it is ungrammatical.

We would usually ask, When is the delivery day? or, less brusquely, Can/could you tell me when the delivery day is? or perhaps just, Do you know when it will be delivered?

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