只用只用that，只用，只用which，只用，只用who引导定语从句的情况引导定语从句的情况1.先行词是不定代词,如all, few, little, much, none,something, everything , anything, nothing等;2.先行词被不定代词修饰,如all, any, every, few,much, little, no, some等;3.先行词被序数词或形容词最高级修饰;4.先行词被the only, the very, the same, the last, the right等修饰;5.先行词既有人又有物。只用只用that引导定语从句的情况引导定语从句的情况.被修饰词为数词时。 Yesterday I caught two fish and put them in a basin of water. Now you can see the two that are still alive.当主句是以 which，who, what开头的特殊疑问句时。.主句是There be结构，修饰其主语的定语从句宜用that作关系代词。Theres still a seat in the corner that is still free. 、定语从句中缺表语时，该关系代词宜用that。 He is not the person that he was ten years ago.只用只用that引导定语从句的情况引导定语从句的情况1) 关系代词前有介词时关系代词前有介词时 There are many trees under which they can have a rest.2)在非限制性定语从句中先行词本身是在非限制性定语从句中先行词本身是that 时用时用which;3) 当先行词当先行词way表示表示“方法方法”，“方式方式”之之意时，引导定语从句的关系词可以是意时，引导定语从句的关系词可以是that, that可省略，也可用可省略，也可用in which。只用只用which引导定语从句的情况引导定语从句的情况指人时指人时that与与who的区别的区别1. 先行词是先行词是one, ones, anyone或或those时时,及及he/she/I / they作先行词时，作先行词时，关系代词用关系代词用who.Anyone who breaks the law is punished.Those who break the law are punished.He who breaks the law is punished.2. 在在there be开头的句子中，开头的句子中，关系代词用关系代词用who 。Theres a beautiful girl who came to see you this morning.3.先行词后有一个较长的定语，先行词后有一个较长的定语，关系代词用关系代词用who 。I met a foreigner in the city last week who could speak Chinese well.