Hi, Jorge! Both "rise" and "raise" mean "to go up," but the difference is that "rise" is intransitive and takes no direct object, whereas "raise" is transitive and must have a direct object. Here is an example: "The sun rises at 5:00 AM." Because the sun itself is the one going up and isn't acting to have something else go up, we use "rise." "She remembered to raise her hand." The direct object is her hand, so she has to "raise" it. If she was going up herself, she would "rise." I hope this helps. Please let me know if you have any more questions =)