that 是指示代词作定语
that red one is mine 这里是什么啊I want that red one这里呢？That red one is mine .这是系表结构，有两个定语that 定语red 定语one 主语is 系动词mine 表语I want that red one . 本句也有两个定语I 主语want 谓语that 定语red 定语one 宾语