Changes in Parts of Speech: Adverbs with -게
Sometimes you want to tell someone how hard you are studying or you want to say how great you can sing. For those things a language has adverbs. You probably know a lot of Korean adverbs, but did you know you can easily turn any Korean adjective in an adverb? You simply need to know how to use -게.
If adjectives tells something more about a noun, than an adverb tells you more about a verb. It is uncommon that you go throughout an entire day without ever using an adverb. Perhaps you want to tell how early you woke up today. Or perhaps how fast you had to run just so you could make it to school in time. All of those things can be done with adverbs. You probably know a lot of Korean adverbs, but did you know you quite easily make new Korean adverbs with adjectives?
To turn an adjective in an adverb is very easy. In fact it will remind you a lot of how you do it generally in English. To turn a Korean adjective into an adverb, you need only the ending -게. By simply attaching -게 to the adjective stem you have effectively turned the adjective in an adverb.
However, you need to keep in mind a few practical issues with such a general use. First there are a few special adverbs that are used exclusively, in favour of their -게 adverb form. Two examples of such adverbs are 많이 (많다) and 일찍 (이르다). While you can use 많게 and 이르게 respectively, these forms will be considered strange. The second thing to keep in is that for some adverbs you can make the choice without it feeling strange. Example of this is 조금/적게 (적다) and 빨리/빠르게 (빠르다). Keep these tidbits of information in your mind.