-겠-

Contraction of older and synonymous 게 하였 (-ge ha-yeot-), 게 ᄒᆞ엿 (Yale: -key hoy-es-) in historical spelling.[1][2][3] 게 ᄒᆞ엿 (Yale: -key hoy-es-) has been used with future meaning since the late sixteenth century.[1]

In Modern Korean, 게 하였 (-ge ha-yeot-) most literally means "caused [one] to [VERB]", e.g. 먹게 하였다 (meok-ge ha-yeot-da, “[I] made [him] eat”). Hence, there are multiple theories with regards to the semantics. Some believe that the verb 하다 (hada) in this context was synonymous to 되다 (doeda), and hence that the construction originally had the same meaning as modern 게 되었 (-ge doe-eot-), e.g. 먹게 되었다 (meok-ge doe-eot-da, “[he] ended up eating”).[2] Others believe that the suffix developed from a more reflexive use of the causative, equivalent to modern 도록 하였 (-dorok ha-yeot-), e.g. 먹도록 하였다 (meok-dorok ha-yeot-da, “[he] decided to eat”).[1][4]

Increasingly displaced older future-like 으리 (-euri-).

겠 • (-get-)

1. A general future speculative suffix; it attaches directly to the stem, including the honorific 으시 (-eusi-), and precedes another verbal suffix.
   1. (mainly used with 1st person or in quotative sentences) will, intend: a suffix indicating that the subject intends to do the action in the future with their own efforts, thus showing their will, determination.

      다시는 담배를 피우지 않겠다!

      Dasi-neun dambae-reul piuji anketda!

      I won't smoke again!

      철수가 오늘 김밥을 먹겠대요.

      Cheolsu-ga oneul gimbab-eul meokgetdaeyo.

      Cheolsu said he would eat kimbap today.

   2. will, may: A suffix denoting guess or assumption of varied possibility.

      내일 비가 오겠네요.

      Naeil bi-ga ogen-ne-yo.

      Tomorrow it will probably rain.

      어제 모스크바에서도 눈이 내렸겠지요?

      Eoje Moseukeuba-eseo-do nun-i naeryeotget-ji-yo?

      It probably snowed in Moscow too yesterday, right?

   3. will, would: A suffix indicating an indirect polite proposal with some degree of future supposition.

      제가 말을 좀 해도 되겠어요?

      Je-ga mar-eul jom hae-do doegesseoyo?

      Would it be okay if I said something?

• (difference with 을 것이다 (-eul geosida))

겠 (-get-) and 을 것이다 (-eul geosida) both convey the subject's desire or the speaker's hypothesis, and often have (by extension) a future sense. However, 겠 (-get-) conveys a hypothesis based on the speaker's subjective beliefs or sentiments, or based only on information perceived at the present moment. Meanwhile, 을 것이다 (-eul geosida) conveys a hypothesis based on information exterior to the speaker or beyond that perceived at the present moment.

Thus 고기가 맛있겠다 (gogi-ga masit-get-da) means that the speaker feels that the meat will taste good based on what it looks like at the moment of speaking, whereas 고기가 맛있을 거야 (gogi-ga masisseul geoya) means that the speaker has some exterior justification for believing that the meat will taste good—having previously tasted it, for instance.

The contrast extends to statements about the subject's desire. Thus 저는 미국으로 가겠습니다 (jeo-neun migug-euro ga-get-seumnida) emphasizes the speaker's subjective desire to go to America, while 저는 미국으로 갈 것입니다 (jeo-neun migug-euro gal geosimnida) implies that the speaker has not only the desire to go to America, but also some objective reason for believing that they will be able to do so.

• (dialectal differences)

In southern dialects such as Jeolla and Gyeongsang, this suffix can only be used for prediction. To express one's will or desire, use 을라 (-eulla-) in Jeolla and northern Gyeongsang, and 을끼다 (-eulkkida) in southern Gyeongsang. Note that 을끼다 (-eulkkida) is the dialectal pronunciation of 을 것이다 (-eul geosida).

• 게엿 (-geyeot-), 게얏 (-geyat-) – Early Modern
• 갯 (-gaet-) – Hamgyong
• 겄 (-geot-) – Jeolla, Chungcheong, southern Gyeongsang
• 갔 (-gat-) – parts of Gyeonggi, Gangwon
• 갓 (-gat-) – Hwanghae, Pyong'an, Yukjin

• 을 (-eul, irrealis adnominal suffix)

From Middle Korean -것- (Yale: -kes-), from -거- (Yale: -ke-, perfective or confirmative marker) + -ㅅ- (Yale: -s-, exclamatory marker).[2] It has since merged with the suffix above phonologically.

겠 • (-get-)

1. Used to strongly confirm that something is the case; nowadays, it is typically followed by another clause which draws a conclusion based on that fact.

   집에 들어가기는 싫고 날씨도 좋겠다, 카페나 가볼까?

   Jib-e deureo-gagi-neun silko nalssi-do jo-ket-da, kape-na ga-bolkka?

   I don't want to go back home, and the weather is really nice; should I just go to a café?

   • 1908, 이인직, 雉(치)岳(악)山(산), volume I, page 32:

     ᄀᆡ화ᄒᆞᆫ 아들 잇것다 ᄀᆡ화ᄒᆞᆫ 며누리 잇것다 집이 잘 되지 망ᄒᆞᆯ 리가 있소

     gaehwa-han adeul it-geot-da gaehwa-han myeonuri it-geot-da jib-i jal doeji mang-hal ri-ga itso

     We do have a Westernized son, we do have a Westernized daughter-in-law; of course our family will do well, how on earth could it go to ruin?

• The subject of the verb is usually followed by the particle 도 (-do, “even, too”).
• Always followed by 다 (-da, declarative suffix), even though it is not sentence-final.

• 것 (-geot-) – Early Modern, southern dialectal