妹にプレゼントを買ってあげました

N5 妹 imouto younger sister N4 プレゼント purezento present, gift

N4 妹 mai / imouto younger sister, soeur cadette, hermana menor N4 買 bai / ka.u buy, acheter, comprar

N4 〜てあげる te ageru Indicates doing something for another person, attaches to the te-form verb, can sound patronizing if used carelessly N5 〜ます masu Used at the end of verbs, polite present or future form, makes the sentence more polite N4 〜し shi Indicates multiple reasons or qualities, connects clauses or adjectives, means besides that, and also N5 〜を o Marks the direct object of an action, appears before the verb, shows what receives the action N5 〜に ni Indicates destination, target, arrival point, specific time, or person receiving an action