what are （you / they） doing回答如下：
I am doing sth或者they are doing sth。
解析：what are sb doing询问的是某人正在做什么，所以回答可以用某人正在做的事情即可，如I am reading，我在阅读。
举例：be doing
音标：英[biˈduːɪŋ]，美[biˈduːɪŋ]。
释义：现在进行时；进行时；现在进行；表将来；正在做某事。
“do”的例句：
1、The kitchen's always so messy after we've had guests. Give me a hand to do it over,will you.
家里来了客人之后，厨房总是那么乱，请你帮助我们清扫一下好吗？
2、Never link the audio out to the vcr and the monitor by connect them to each other as you will do at.
千万不可象许多人在家里做的那样将音频连接到VCR和监视器上。
3、"He picked up a strange cat and it bit him." "More fool him; he should have known it would do that.
"他捡起一只陌生的猫，被它咬了一口。""我觉得他那样做真傻。他早该知道那猫是会咬人的。"
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