I glad to your effort and hope my advices will help. The parentheses are native colloquial. I notice that all the sentences are not honorific. If you want that, comment it. 1. Do you know where your classroom is? - 너 어느 반이니? (몇 반이세요?) 2. Do you remember who your teacher is? - 담당 선생님이 누구니? (누가 가르치니?) 3. Do you understand what the teacher is saying? - 이해했니? 4. Do you need help with your classwork? - This sentence is awkward meaning in Korean I think. I recommend "Do you understand the lesson well?" So that '수업 내용이 이해가니?' is the best translation. 5. What should we do next? - (In literal translation) 다음엔 뭐하지? - If you use this sentence in classwork process, I recommend another one. 6. Did you finish eating your lunch? - 점심 잘 먹었니? 7. Put down your lunch bag over there. - 도시락은 저쪽에 두세요 8. It is not time to go to recess yet! ( = "It's still in class." is the better expression in Korean.) - 아직 수업시간입니다.