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‘-을/ㄹ 거예요’ is placed after a verb stem and is used to show that the speaker is guessing something. The subject is usually in the third person. When the verb stem ends with a consonant, use ‘-을 거예요’. When the verb stem ends with a vowel or a consonant ‘ㄹ’, use ‘-ㄹ 거예요’.

● 내일은 비가 올 거예요. (It will rains tomorrow.)
● 벌써 10시니까 아마 집에 있을 거예요. (She will be at home because it’s 10 o’clock.)