Bắt lỗi tận gốc
Thầy giáo nói với học sinh:- Em hãy mời ông của em đến gặp tôi!- Dạ, ý thầy muốn mời "ông bố" của em? - Không, mời ông của em. Tôi muốn chỉ cho ông ấy xem con trai ông ấy đã phạm những lỗi gì trong vở bài tập về nhà của em.
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