while you're at it…
Joseph: Do you want me to go to the store and shop for food for the barbecue?
Susan: Sure, and while you're at it, could you stop by the post office and mail a couple of letters for me?
Joseph: Sure, it's on the way to the store. No problem.
Explanation: If you are doing something and another person wants you to do a similar task, they can say while you're at it, could you….
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