同学你好，该知识点来自沪江网校《英语零基础直达大学六级全能畅学卡【随到随学班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
1 He likes coffee, but I don't.   因为前一句，like是实意动词，所以后面用助动词don't来对应
2 She likes tea, but he doesn't. 同上，只是因为he是第三人称单数主语，所以用助动词doesn't
3 He is eating some bread, but she isn't. 前一句的助动词是is，后面直接用be动词对应
4 She can type very well, but he can't.  前一句情态动词是can，情态动词也属于助动词，所以后一句用can
5 They are working hard, but we aren't. 前一句助动词是are，后面也用be动词。
6 He is reading a magazine, but I am not. 同上

祝同学学习进步~