The future and plans

The present already covers the near future: 내일 가요 "I'm going tomorrow". Korean also has several endings for what is ahead, which differ in how sure and how personal they are.

-(으)ㄹ 거예요: will, going to, probably

For plans and predictions. -ㄹ 거예요 follows a vowel or ㄹ, and -을 거예요 another consonant. It is said 꺼예요.

• 주말에 친구를 만날 거예요.
  jumare chingureul mannal geoyeyo.
  I'm going to meet a friend at the weekend.
• 내일은 비가 올 거예요.
  naeireun biga ol geoyeyo.
  It'll probably rain tomorrow.

The formal form is -(으)ㄹ 겁니다, and the casual -(으)ㄹ 거야.

-(으)ㄹ게요: I'll (for you)

For what you decide or promise to do, with the listener in mind. It is only for "I" or "we", and is said 께요.

• 제가 할게요.
  jega halgeyo.
  I'll do it.
• 이따가 전화할게요.
  ittaga jeonhwahalgeyo.
  I'll call you later.

-겠-: will, must be

-겠- shows the speaker's firm intention, common in formal and business speech (다시 오겠습니다 "I'll come again"), and a guess from what you see or hear: 맛있겠다! "that looks tasty!" It is fixed in some everyday phrases: 알겠습니다 "understood", 잘 먹겠습니다 "thank you for the meal (before eating)", 모르겠어요 "I'm not sure".

-(으)ㄹ까요?: shall we? shall I?

A suggestion or an offer, as a question: 같이 갈까요? "shall we go together?", 창문을 열까요? "shall I open the window?" With a third person, it wonders: 비가 올까요? "do you think it will rain?"