Hi Oliwia, Both choices confer very similar meanings of one's ability to do something. "I'm able to" is probably used for more formal contexts. Example: Can you solve this math problem? (Informal) Are you able to present your research data? (More formal) Just as a side discussion: If we consider the second person pronoun (you), "You can" is used for (1) indicating someone else's ability to do something (2) giving someone permission to do something. Example: (1) Come on, you CAN do it! (2) Yes, you CAN be dismissed. Hope this helps. Cheers, Lance