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So do I .表示"我也是这样"，用以表示同意；而句型"so＋代词＋助动词"表示"……确实如此"（带有惊异的意味）。试比较： "I like fish .""So do I ." "我喜欢吃鱼。""我也喜欢吃鱼。" "You like fish .""So I do ." "你喜欢吃鱼。""正是如此。" "It's her turn .""So it is ." "该轮到她了。""确是这样。" "He is very strict with himself ." "So he is ." "他对自己非常严格。""是如此。" "You have to start early .""So I do ." "你得早点出发。""确是这样。" "She's made a mistake about me ." "So she has ." "她误会我了。""她的确误会你了。" "Li Ping speaks English very well ." "So he does ." "李平英语讲得很好。""他确实讲得不错。"