Prepositional idiom: select the correct preposition after “lesson” in a topic phrase Complete the grammar-focused sentence with the right preposition: "My first lesson ______ forgiveness came from my mother." Choose the best option.

Given data

• Phrase: “first lesson ______ forgiveness.”
• Goal: choose the idiomatic preposition.

Concept/Approach
With the noun lesson, the standard preposition for the subject area is in (e.g., “a lesson in patience,” “a lesson in physics”).

Option analysis
in — correct, idiomatic: “lesson in forgiveness.” ✅on / about / regarding — sometimes used with talks or articles (“a talk on…”), but lesson in is the fixed collocation.

Common pitfalls

• Transferring the “talk on/about” pattern to “lesson,” which conventionally takes “in.”

Final Answer
in