틀린부분 바꾸는건데 ..
1.his studies the brain to find out why and how music moves us.
- his 가 he 로 왜 되는건가요 ㅜ

2. small group activities were helping for me to have more confidence in speaking in english
-helping이 helpful 이 되는이유좀 알려주세요

3.prior to enrollment, employees must receive approving from their respective department supervisor.
-approving 이 approval 로 되는이유좀 알려주세요..

자세하게 알려주시면 정말 감사드릴꼐요 ㅜㅜ