* As a noun: The professor gave a lecture on the history of the Roman Empire.
* As a verb: The teacher lectured the students about the importance of studying.
* With a negative connotation: I wish my parents would stop lecturing me about my messy room.
* With a formal tone: The diplomat lectured the international audience on the importance of diplomacy.
* In a playful way: My dog lectured me with a sad look and a whine after I accidentally stepped on his tail.
Let me know if you'd like more examples!