When verbs are used as attributes in a non-final position (meaning they are not the last word in a sentence), they are called participles. Descriptive verbs and action verbs form participles differently. The participle is placed before the modified word.
Examples:
따뜻한 날씨 "warm weather"
학교에 가는 친구 "friend who is going to school"
There are also a number of adverbial participles.
See Also: