eng: lesson registration
eng: lesson period, a lesson duration
eng: lesson plan
eng: lesson hour
eng: lesson structure
eng: lesson presentation
eng: unit
eng: lesson resource
eng: number of attendees
eng: group in a lesson
eng: attendance in lessons, participation in the lesson
eng: extracurricular activities
eng: extracurricular activity hours
eng: synopsis of a lesson
eng: effectiveness of a lesson
