什么叫名词性从句.形容词性？

名词性从句

在句子中起名词作用的句子叫名词从句 (Noun Clauses）。 名词从句的功能相当于名词词组, 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等，因此根据它在句中不同的语法功能，名词从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。

形容词性从句--定语从句
用来修饰名词,代词,句子等,在句中的作用相当于形容词,故称为形容词性从句.
定语从句分为限制性定语从句和非限制性定语从句.
限制性定语从句对被修饰词起到限制,修饰的作用,一般不可缺少.
非限制性定语从句起补充,附带说明作用,缺少也不会影响全句的理解.
e.g. She said she had finished her work, which I doubted very much.
I've got some personal affairs that I have to deal with.
定语从句常用关系词
关系代词:who, whom, whose, that, which, as等(在句中作主,表,宾,定等成分)
关系副词:where(on which), when(in which), why(for which)(在句中作状语)
关联词:that(引导表示方式,时间的定语从句)
e.g. In this earthquake, the number of people who lost homes reached as many as 250,000.
I have many good friends to whom I am going to send postcards.
You're the only person whose advice he might listen to.
The river which runs through the center of the city brings us a lot of pleasure.
He has given us as much advice as he can.
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