He had a profound realization about the problem.

Please tell me the stem of this word.

He spent a night in the old warehouse.

The concert tickets are completely sold out.

The concert tickets sold out quickly.

Learning about the history of Samhan is very important for understanding ancient East Asian culture.

I love the taste of licorice.

He is scheduled to undergo liver transplantation surgery.

I will humbly return this wallet.

I returned the book to the teacher.