A: What can I do for you? 要办什么事？ B: Can you cash this check for me? 你能为我兑现这张支票吗？ A: May I ask what you need so much cash for? 我能问您需要这么多现金干什么吗？ B: Yes, I want to make a purchase. 可以，我要做一笔生意。