定语从句二。
一引导词只用that
1.当先行词有形容词最高级或序数词(包括last, next等)等修饰时，通常用that：
this is the best dictionary that i’ve ever used. 这是我用过的最好的词典。
the first thing that you should do is to work out a plan. 你应该做的第一件事是订个计划。
2.当先行词much, little, none, all, few等修饰时是下列不定代词或被它们much, little, none, all, few, every(thing), any(thing), no(thing) 等时，通常用that：
the sleeping man’s subconscious mind retained everything that was said around him. 这位酣睡的人头脑的下意识能记住他周围的人说的话。
3.当先行词有the very, the only, the same 等修饰时，通常用that：
this is the only example that i know. 我知道的例子只有这一个。
those are the very words that he used. 那是他的原话。
4.当先行词是一个既指人又指物的并列词组时：
i made a speech on the men and things that i had seen abroad. 我就我在国外所见到的人和事作了报告。
they talked about the persons and things that most impressed them. 他们谈论了使他们印象最深的人和事。
5.当疑问词是who，which时(为避免重复)：
who was it that won the world cup in 1982? 谁赢得了2023年的世界杯？
which is the course that we are to take? 我们选哪门课程？
当关系代词在定语从句中作表语时(可省略)：
6.当先行词是下列不定代词much, little, none, all, few, every(thing), any(thing), no(thing)
all that she lacked was training. 她缺的只是训练。
do you h**e everything that you need? 你需要的东西都有了吗？
she would never do anything that was not approved of by her parents. 她父母不赞同的事她绝不会做。
7.当关系代词在定语从句中用作表语时，通常用that：
china is not the country (that) it was. 中国已不是过去的中国了。
tom is not the boy (that) he was. 汤姆这孩子已不是以前那个样子了。
二引导词只用which
1. 关系代词前有介词时；
this is the room in which lu xun lived.
2. 非限定性定语从句中；
he has a daughter, who works in a hospital.
3 .先行词本身是that时；
the clock is that which tells the time
we arrived the day that(on which) they left. 刚好我们到的那天他们走了。
三引导词只用who
1、先行词为one, ones, anyone, those指代人时。
the person i want to learn from is one who studies hard and works well.我最羡慕的是学习勤奋，工作出色的人。
2、在there be结构中，修饰主语的定语从句宜用who关系代词指代人。
there’s a gentleman who wants to see you.有位先生想见你。
3、当先行词有较长的后置定语时。
i met a foreigner in the park yesterday afternoon who could speak chinese very well.昨天下午我在公园里遇到一位中文讲得非常好的外国人。
4、一个句子中带有两个定语从句，其中一个定语从句的关系代词是that, 另一个宜用who以避免重复。
the student that was praised at yesterday’s meeting is the monitor who is very modest and works very hard.受到校长表扬的学生是位谦虚好学的班长。
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