El nu poate să facă asta.

what is the difference between “face” and “facă”?

English Translation

He is unable to do it.

"Facă is the 3rd person singluar subjuctive form which always must come after “să”.
El face asta - he does it.
El poate să facă asta - he can do it.
Also possible is: el poate face asta (without să, so “face” not "facă).

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