A ; Mom. I lost my English book.
     - 엄마, 영어책을 잃어버렸어요.          

B : Put your name in all your books not to lose it.
     - 모든 책에 이름을 적어 두어라.

A : I'm sorry. I'll keep your word in mind.
     - 죄송해요, 명심할께요.