问题描述： 英文中isn't的解释如题 1个回答 分类：英语 2014-12-03 问题解答： 我来补答 is not = isn't 用于第三人称的否定.如：Mary isn't a student.玛丽不是学生Tom isn't having lunch.汤姆不在吃午饭The cat isn't white.那只猫不是白色的 展开全文阅读
