what are they doing today 可不可以换成what do they doing today

问题描述:

what are they doing today 可不可以换成what do they doing today

不可以:但可以这样what do they do today

不能,这将是个语法错误

不能,因为语法错误
可以说what are they doing today?
或者what do they do today?
或者what did they do today?
或者what have they done today?
上面都可以,但是意思不同,各有侧重