Can I say "what are you up to" instead of "what are you doing"?
Yes, you definitely can! "What are you up to" is another way of asking "what are you doing." It is a way of asking what the person is currently doing and is also a way to learn what new things are happening in that person's life. Ex: A: Hey, what are you up to? B: Not much. Just watching t.v. Ex: A: What are you up to? B: Cooking dinner.
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