that的作用Harm puppy love that are as brief as soap bubbles.that作用是什么呢?

that的作用Harm puppy love that are as brief as soap bubbles.that作用是什么呢?
that的作用
Harm puppy love that are as brief as soap bubbles.that作用是什么呢?

that的作用Harm puppy love that are as brief as soap bubbles.that作用是什么呢?
连接词,这是定语从句.that=harm puppy love

你给出的那句句子，牵涉到一个语法知识点，就是定语从句，又叫做形容词性从句。
在复合句中，修饰某一名词或代词的从句叫定语从句。定语从句（Attributive Clauses）通常皆放在它所修饰的名、代词之后，这种名、代词就叫做先行词。引导定语从句的关联词为关系代词和关系副词。
引导定语从句的关系代词有who、whom、whose、that、which等。who、whom、whose...

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你给出的那句句子，牵涉到一个语法知识点，就是定语从句，又叫做形容词性从句。
在复合句中，修饰某一名词或代词的从句叫定语从句。定语从句（Attributive Clauses）通常皆放在它所修饰的名、代词之后，这种名、代词就叫做先行词。引导定语从句的关联词为关系代词和关系副词。
引导定语从句的关系代词有who、whom、whose、that、which等。who、whom、whose指人。who是主格，在定语从句中作主语，whom是宾格，在定语从句中作宾语，whose是所有格（属格），在定语从句中作定语，有时也可以指物。
A doctor is a person who looks after people‘s health.
The man whom I saw is called Smith.
I'd like a room whose window looks out over the sea.
that在从句中既可用作主语，也可以用作宾语，既可指人，也可以指物。如：
A letter that is written in pencil is difficult to read.
The letter that I received from him yesterday is very important.
Is he the man that sells eggs?
which在从句中既可作主语，也可以作宾语，一般皆指物，当然它在从句中也可以用作定语和表语。
This is the book which has been translated into a lot of languages.
Where is the book which I bought this morning?
A lot of people want to learn Spanish, which language is difficult to learn.
The two policemen were completely trusted, which, in fact, they were.
as、than、but也可以作关系代词。
He was from Texas, as I knew from his accent.
You spent more money than was intended to be spent.
There is no rule but has some exceptions.
但是以下情况下只能用that作为关系代词。
All that glitters is not gold. （先行词为不定代词all、everything、something、anything等）
It was the largest map that I had ever seen.（先行词被形容词最高级所修饰）
The first place that I want to go to is Washington. （先行词被the only、the very、the last和序数词所修饰）
She looked at the children and parcels that filled the car. （先行词兼指人与物）
There is a house that has bay windows. （that在这里表示固有的特点）
先行词作介系词宾语时，介系词可以置于从句的首位，也可以置于句末，但是关系代词who与that作介系词宾语时，介系词要置于句末。
This is the book for which you asked.
The people who you are talking to are from Sweden.
This is the car that I talked to you about.
引导定语从句的关系副词有when、where、why。它们在从句中作状语。先行词表示时间时，关系副词用when，表示地点，关系副词用where，先行词为reason的时候，关系副词用why。
He came last night when I was out.
He has reached a point where a change is needed.
That is the reason why I like the movie "The Sound of Music" best.
定语从句又可以分为限制性定语从句和非限制性定语从句。前者与先行词关系密切，因此不可缺少，否则会影响从句的意义。
What is the name of the boy that we brought last week?
That is the reason why I decided not to go to college.
后者只与先行词有一种松散的修饰关系，用逗号隔开，念时主句的语调要往下降，从句的关系代词和关系副词是不能省略的，that和why一般不引导非限制性定语从句。如：
Water, which is a pure liquid, has a lot of usages.
He and his family moved to Italy, from where he moved to Moscow to go to college.
非限制性定语从句形式上是从句，其功能则相当于一个分句，叫做接续性从句，如：
Afterward he met Mary, who invited him to a party.
有时非限制性定语从句的意思相当于一个状语从句，如：
I want him, who knows some English.
你给出的那句句子，that是一个关系代词，引导出一个定语从句，用来修饰puppy love，即初恋的意思，在从句中作主语。这句话的意思是说，“有害于像肥皂泡一样简短的初恋”。希望我能帮助你解疑释惑。

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