Your face are red. What have you been doing/What have you done?
Can I use both tenses?
Your face is red. What have you been doing? (Perhaps he's just been jumping up and down vigorously on the bed.
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Your face is red. What have you been doing? (Perhaps he's just been jumping up and down vigorously on the bed. He is hot and sweaty.)
Your face is red. What have you done? (He's embarrassed and ashamed because his father just discovered that he had taken some money from his father's wallet to buy some toys.)