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을 못 하면

if [someone] can't do [something]

→ 을
phrase Common #2,405
if [someone] can't do [something] 을 marks the object of the verb. The examples show the related pattern 을 못 하다, meaning “can't do” or “is unable to do.”
KO: 운전을 못 하면 택시를 타세요.
EN: If you can't drive, take a taxi.