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The ending ㄹ 거예요 (l geo-ye-yo) is used in Korean to express future intentions, predictions, or assumptions. You should use ㄹ 거예요 with verb stems that end with a vowel, such as 보다 (boda, “to see”), 가다 (gada, “to go”), and 자다 (jada, “to sleep”).
Example:
하다 = to do
하 + ㄹ 거예요 = 할 거예요
하다 (to do) → 할 거예요 means “I will do” or “I’m going to do.”