lecturing

"Both paper and plastic can be recycled."

"Responsibility is a heavy burden."

"deliver a captive from the prison"

"During class today the professor delivered an interesting lecture."

"The morning classes at school begin at 8:00 a.m. "

"Attending all your classes is of great importance to your success in school. "

"Professor Smith, the head of the history department, gave a fascinating lecture on the Roman Empire. "

"The teacher's harangue about the importance of homework lasted for fifteen minutes. "

"Often used to imply membership of a large class."

"That famous singer, somebody everyone recognizes, is performing at the school concert. "

"I have forgotten most of the things I learned in school."

"The professor lectured to two classes this morning."