When would you use "perché non mi rispondi" vs "perché non rispondi"?

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the difference in english is:
perché non mi rispondi - why don't you answer me?
perché non rispondi - why don't you answer?

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wrong my Italian mates:).
In this sentence, we add "mi", if we want to emphasise/stress the subject. Especially if you are angry with the listener.

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maybe you can use "perché non mi rispondi" it's more common.

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50% chance of using any of the two, really.