"The man cannot tie a tie."
Translation:남자가 넥타이를 못 맵니다.
I think you can, as long as you know the difference between the 2 expressions:
ㄹ 수 있어/없어 --> impossibility, incapacity
그는 인내심이 없기 때문에 넥타이를 맬 수 없습니다 He can't put on (incapable of putting on) a tie because he has no patience
못 --> inability, negation, prohibition
그는 수영장에서 넥타이를 못매다 He cannot wear a tie in the swimming pool (= he is not to wear one).
그는 오늘 티셔츠를 입서 넥타이를 못맵니다 He wears a T-shirt today so he can't/doesn't put on a tie.