Relative Clauses 使用
关系从句是复合句的一部分，用于提供有关人物或事物的重要信息。
The person who called you is my brother.
This is the restaurant where we first met.
关系从句主要有两种类型：
- 限定性关系从句提供关键信息
- 非限定性关系从句提供补充的、非关键信息
Defining Relative Clauses
限定性关系从句提供关键信息，因此不能从句子中去掉。- 不以逗号分隔
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关系代词可以替换为 that
The teacher who helped me was very kind. The teacher that helped me was very kind.The laptop which I bought yesterday is expensive. The laptop that I bought yesterday is expensive.
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在某些情况下，当关系代词 who / which / that 在从句中作宾语时，可以被省略
The movie that we watched yesterday was amazing. The movie we watched yesterday was amazing.The person who I met at the conference was very friendly. The person I met at the conference was very friendly.The book which she recommended helped me a lot. The book she recommended helped me a lot.
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在 all、everything、nothing、something、anything、the only、the first、the last 这些词之后，我们通常不使用 which 或 who，一般会用 that 来代替。
All that we need now is a little patience.
Everything that he said was true.
Nothing that you do can change the situation.
Something that you told me yesterday made me think.
Anything that helps you learn is worth trying.
She is the only person that understands me.
This is the first book that really inspired me.
That was the last message that he sent me.
Defining Relative Clauses examples
The student who sits next to me is from Brazil.
The car that I bought last year is already having problems.
The restaurant where we usually have lunch is closed today.
The woman whose laptop was stolen called the security guard.
The book that you recommended helped me understand the topic.
Non-defining Relative Clauses
非限定性定语从句提供的是附加的、非必要的信息，删去它们也不会改变句子的主要含义。-
总是用逗号分隔
My sister, who lives in Paris, is visiting me next month.
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我们使用 who / which / whose / whom；不能使用 that
This book, which was published in 1990, is now very rare.
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在非限定性定语从句中，关系代词不能被省略
The museum, where we spent the whole day, is being renovated.
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Which 可以指代整个前一句，从而对情境作出评论
She didn’t come to the meeting, which surprised everyone.
Defining Relative Clauses examples
My brother, who works as a lawyer, lives in London.
This laptop, which I bought on sale, has a very good battery life.
Our teacher, who is very strict, rarely cancels classes.
The museum, which was founded in 1920, attracts thousands of visitors every year.
Paris, where I spent my childhood, will always feel like home to me.