아야/어야 하다 and -(으)ㄹ게요 are important grammar patterns in the Korean language. -아야/어야 하다 is used to express obligation or necessity, meaning “must” or “have to do something.” It shows that an action is required. On the other hand, -(으)ㄹ게요 is used when the speaker makes a decision or promise to do something, usually for the listener. It expresses the meaning of “I will do it.
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