-게

-게 turns an adjective (or verb) into a word that describes how an action is done, or shows the goal "so that…".

정도·비교Degree & comparison

Han: -(으)ㄴ makes an adjective describe a noun (깨끗한 방); to describe how a verb is done, use -게.

Examples

뒤에 있는 사람도 들을 수 있게 크게 말해 주세요.Please speak loudly so that the people in the back can hear too.

어제 일이 많아서 늦게 잤어요.I had a lot of work yesterday, so I went to bed late.

주말에 방을 깨끗하게 청소했어요.I cleaned my room thoroughly on the weekend.

감기에 걸리지 않게 옷을 따뜻하게 입으세요.Dress warmly so that you don't catch a cold.

A/V+게

깨끗하다 → 깨끗하게, 늦다 → 늦게, 들을 수 있다 → 들을 수 있게

Put the tense on the final verb, not on -게: 늦게 왔어요, not 늦었게 왔어요.
In the "so that" meaning, the -게 clause can have its own subject, different from the main clause: 아이가 잘 수 있게 조용히 하세요.
In this use -게 does not end the sentence; a main verb must follow it (크게 말하세요).
Some adjectives also have a -히/-이 adverb (조용히, 깨끗이); both forms are usually fine, but in daily speech 빨리 is far more common than 빠르게.

Wrong: ~~주말에 방을 깨끗한 청소했어요.~~

Right: 주말에 방을 깨끗하게 청소했어요.

-(으)ㄴ makes an adjective describe a noun (깨끗한 방); to describe how a verb is done, use -게.

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