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		     用法透视     该句型本意是表示某物是干什么用的,也可以用来询问对方为什么要干某事,相当于"why"。     支持范例     1. What is it for?     这是干什么用的?     2. What did you say that for?     你为什么要那样说?     3. What do you need so much money for?     你要这么多钱干什么?     会话记忆     A: Do you mind if I ask you to practice speaking English with me?     我想请你帮我练习说说英语,你介意吗?     B: No. Of course not. But what for?     当然不介意。但为什么呀?     A: Well, I'm meeting some American friends next weekend.     哦,我这个周末要会见一些美国朋友。     B: I see. But I'm busy now. How about tomorrow?     我明白了。但我现在很忙,明天行吗?
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