Every Chinese textbook teaches the standard greetings firstly, but as an American, I often failed to find proper words to say to my guests when they are leaving.

• 每一本汉语的教科书开头都有标准的短语,教你如何跟人打招呼,可是作为一个美国人,在送客人到门口时,我经常发现自己说不出话来。