She doesn't studies at this school.改错.what do your grandfather do every day?

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She doesn't studies at this school.改错.what do your grandfather do every day?
She doesn't studies at this school.改错.what do your grandfather do every day?

She doesn't studies at this school.改错.what do your grandfather do every day?
1.studies改为study (does已经体现三单,studies要还原为原形)
2.do改为does(your grandfather 体现三单,故用助动词does)

1 studies -> study ( doesn't 后接动词原形)
2 第一个DO 改为does ,因为主语YOUR GRANDFATHER是三单。
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She doesn't study at this school.
What does your grandfather do every day?

studies 改为 study ( 既然借助了助动词后面就接动词原形)
do 改为does(你的奶奶是一个单数,则要借助does)