Hello! I'm trying to advance my sentences from simple "subject + object + verb" to more compound thoughts... practice, practice, practice. If someone is available to check the following sentence for me, I'd really appreciate it.
카라테 수업 전에 저는 도서관에 가서 한국어 공부(를?) 했어요.
Is this the appropriate forum to ask others to check my work and support my learning? If not, please point me in the right direction.
고마워요,
Renee
Grammatically, 를 should be there but in general when we have 하다 as a verb, simply noun + 하다 is acceptable without preposition in colloquial sense 
