General:
* She has a natural aptitude for languages, learning new ones with ease.
* The young artist displayed a remarkable aptitude for painting, even at such a young age.
* His aptitude for problem-solving made him a valuable asset to the team.
Specific examples:
* Despite his lack of formal training, John has a clear aptitude for mechanics.
* The company is looking for candidates with a strong aptitude for teamwork.
* Her aptitude for leadership quickly made her a respected figure in the organization.
Using "aptitude" with "for":
* He has a strong aptitude for math and science.
* She has a natural aptitude for public speaking.
* Their aptitude for teamwork is evident in their successful project.
Using "aptitude" with "in":
* She has a real aptitude in playing the piano.
* The student showed great aptitude in understanding complex concepts.
* His aptitude in handling difficult situations is impressive.