×She can't sings well √_____________

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×She can't sings well √_____________
×She can't sings well √_____________

×She can't sings well √_____________
She can't sing well

X
sings-sing

She can't sing well
can是情态动词,情态动词后一般接动词原形~

she can’t sing well。
否定句中,助词后面都是跟的动词原形。