高一英语要学习更多的句型句式，定语从句就是其中之一，下面就是小编给大家带来的高一英语定语从句知识点，希望大家喜欢！
高一英语定语从句知识点
一、什么是定语(Attributive) :
aloyalfriend 形容词作定语
awomanteacher 名词作定语
a girlwith long hair介词短语作后置定语
falling / fallenleaves 分词作定语
定语从句在句中相当于一个定语的成分起修饰的作用。
二、定语从句的构成：
1）which/that
a. Annawas wearinga hat.
b.Itwas too dirty.
定从： Annawas wearing a hatwhich/thatwas too dirty. （主语）
安娜戴了一顶很脏的帽子。
a.The hatwas too dirty.
b. Anna was wearinga hat
定从： The hatthat/ whichAnna was wearing was too dirty.（宾语）
安娜戴着的那顶帽子太脏了。
2). who/whom
a. I meta boy.
b. Theboy can speak three languages.
定从： I met a boy who can speak three languages.（主语）
我见到了一个能说三种语言的男孩儿。
a. Theboy can speak three languages.
b. I met a boy.
定从：The boy whom/ who I met can speak three languages.(宾语）
我见到的男孩儿能说三种语言。
3. whose
a. We saw some people.
b. Their arms had broken.
定从： We saw some people whose arms had broken.
我们看见了一些手臂受了伤的人。
a. The desk belongs to Mary.
b. The leg of the desk is broken.
定从： The deskwhose leg is broken belongs to Mary.
腿坏了的桌子属于玛利。
三、只能使用关系代词that的几种情况。
1. 先行词为all, little, few,much, nothing, something, anything, everything等不定代词时
e.g.There isnothing thatI can say
2. 先行词被all, each, few,much, every, no, some, any等词修饰时
e.g. I havefewbooksthatyou needed
3. 先行词既有人又有物时
e.g. He talked aboutthe teachers and schoolsthat he liked
4.先行词被序数词或形容词最高级修饰时
e.g. This isthe bestcompositionthatI have read.
5. 先行词被the only, the very,the last等修饰时
e.g. This isthe verymanthatI am looking for.
6. 主句是以who或which开头的疑问句时
e.g.Whois the manthatis holding Mary’s hand?
四、非限定性定语从句 Non-restrictive Attributive Clause
1. “位置形式”：紧接先行词，不用标点分割
e.g. I want to buy the house which has agarden.
2. 用逗号与主句隔开，修饰“主句全句或部分内容”，可置句末，中，首。
e.g. I want to buy the house, which has agarden.
The earth is round, which is known to all
As is known to all, the earth is round.
3.“先行词”
限定性： n. / n. phrase
e.g. He wears a red shirt which makes himlike a girl.
非限定性：1). n. / n. phrase
2). the sentence
e.g. He wears a red shirt, which makes himlike a girl.
“关系词的用法”
限定性：1).关系代词作从句宾语时可省
2). that可替who, whom, which(口)
e.g. This is the book( which/that) I boughtyesterday.
非限定性：1).关系词不能用that
2).不能替换，不能省(which, as)
e.g. I like the book, which I bought yesterday
Do you know Tom, whom we talked about?
She has to work on Sundays,which she doesn’t like.
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