Address forms are very small grammatical phenomenon in language teaching, but they are the most basic and most commonly used in all world languages. In the south of America, Ma'am is a way to show respect to women. It is widely used, but its existence is basically ignored in our teaching. This article first analyzes the reasons why we haven't paid enough attention to the use of ma'am in teaching, then introduces the use situation of Ma'am, and finally focuses on analyzing the reasons why Ma'am is commonly u...