-(으)ㄹ 것이다 (것이에요)

-(으)ㄹ 거예요 talks about the future: with 'I/we' it states a plan you already have, and about others or things it gives your guess ("probably will").

시제·상Tense & aspect

Han: The guess is about yesterday, so the verb must carry the past tense before 을 거예요: 자다 → 잤을 거예요.

Examples

지금 일곱 시니까 민수 씨는 벌써 집에 도착했을 거예요.It's seven now, so Minsu has probably already got home.

이번 주말에 친구하고 영화를 볼 거예요.I'm going to see a movie with a friend this weekend.

방학에 뭐 할 거예요?What are you going to do during the vacation?

내일은 날씨가 추울 거예요. 코트를 입고 가세요.It will probably be cold tomorrow. Wear a coat.

V/A+(으)ㄹ 것이다 (spoken: (으)ㄹ 거예요 / 거야)

past guess: V/A+았/었을 거예요

가다 → 갈 거예요, 먹다 → 먹을 거예요, 춥다 → 추울 거예요, 오다 → 왔을 거예요

In everyday speech the form is 거예요, not 것이에요 or 거에요: after the vowel of 거 the copula is 예요.
With a first-person subject it usually means a plan; with adjectives, weather or other people it usually means a guess.
To guess about something that already happened, put the past tense first: 았/었을 거예요. Plain (으)ㄹ 거예요 cannot refer to the past.
In questions to the listener it asks about their plans: 주말에 뭐 할 거예요?

Wrong: ~~민수 씨는 어제 일찍 잘 거예요.~~

Right: 민수 씨는 어제 일찍 잤을 거예요.

The guess is about yesterday, so the verb must carry the past tense before 을 거예요: 자다 → 잤을 거예요.

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