てあげる

てあげる is used when the speaker (or someone in the speaker's group) does something for someone else, often as a favor or out of kindness. It emphasizes the helper's action for the benefit of the other person. It can sound casual and is commonly used toward friends, family, or someone younger. It contrasts with てくれる, which focuses on what the other person does for the speaker, and with あげる used from the perspective of the giver toward someone else. Use with verbs in て-form to indicate performing the action for someone.