But this doesn't make sense: everyone knows that "it is" and "it's" are both correct English, if different in formality.
但这说不通，每个人都知道“itis”和“it's（it is的缩写）”都是正确的英语表达，只是在语体正式的程度上有区分。
Note the differences in formality and personalness and the degree to which the students recognize the hierarchical difference between themselves and the teacher.
阅读这两个场景对话，注意它们表现出来的正式性程度的不同，以及对师生等级关系的认识差异。
Party B shall be responsible for the completeness, truthfulness in appearance and the legality in formality of the investors' information.
乙方对投资者资料的完整性、表面真实性和形式合法性负责。
Party B shall be responsible for the completeness, truthfulness in appearance and the legality in formality of the investors' information.
乙方对投资者资料的完整性、表面真实性和形式合法性负责。
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