what are they usually do?改错改错,并说理由.快呀,明天就要交!又快又对,我加分!

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what are they usually do?改错改错,并说理由.快呀,明天就要交!又快又对,我加分!
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what are they usually do?改错改错,并说理由.快呀,明天就要交!又快又对,我加分!
what are they usually do?改错
改错,并说理由.快呀,明天就要交!
又快又对,我加分!

what are they usually do?改错改错,并说理由.快呀,明天就要交!又快又对,我加分!
应该是
what are they doing?或者what do they usually do?

do-->doing
are doing 现在分词

应该是are换成do,问的是他经常做什么,are是be动词,不能和动词原型一起用,根据usually“经常”,应该用一般现在时,而不是用现在进行时。

肯定应该改成:
what do they usually do?
因为usually这个副词表示的就是一般现在时,意思是通常,所以只能用一般现在时的谓语来表示。把do 改成doing是错的,因为usually不能用在现在进行时的时态中。
类似的副词还有 often