⑧只能用 which 的情况(不能用 that) 引导非限制性定从 Football, which is a very interesting game, is played all over the world. 关系代词前有介词时 This is the house in which he lived. 先行词本身就是 that 时 That which you told me is what i want to ask. ⑨只能用 who 的情况(不能用 that) There be 结构中 先行词指人时 There is a young lady who asks for you. 先行词是 those, he people 且指人时 Those who want to go have to sign their names here. 先行词是指分的不定代词时,如 one, all, anyone, no one, nobody, anybody, one All who heard the news were excited. ⑩ 特殊规则: 当先行词是 positon, stage, point, situation, case 时,用关系副词 where 引导定从 Can you think of a situation where this expression can be used? 当先行词是 time 并表示“次数”时,用关系代词 that 或者省略不用 This is the first time (that) the president has visited the country. Exercise: The room ( The room( ) he once lived is still there. ) I have to clean every day belongs to my mother. ) I met you. ) we spent together. I will never forget the day ( I will never forget the day ( The reason ( The reason ( ) I don’t know the thing is that i was not there at that time. ) i don’t know is known to him.