what are you do 这个句子的错误在于,没有区分助动词和行为动词的使用问题具体如下:be动词里面,在现在时的情况下,分为am ,is ,are ;过去时则为was ,were那么其后面,通常是1)表语成分(形容词,nice ,big 或者介词 in the room ,等)2)可以是非谓语形式,如分次,不定式,动名词等(His job is washing cars --动名词)3)名词性从句(如表语从句His dream is that he would like to have his own lab .本题这个句子,可以修改为“what are you doing ? 或者what do you d...