非限制性定語從句在句中主要起補充說明作用，在非限定性定語從句與主句之間往往有逗號隔開，獨立存在，確實也不會影響整個句子的意思。小編這次就為大家?guī)矸窍拗菩远ㄕZ從句的講解，一起來看看吧。

1. as引導的非限制性定語從句

as有時作關(guān)系代詞，代替整個主句，對其進行說明

但as也回用于固定搭配，像as we all know, as it is known, as is known to all, as it is, as is said above, as always mentioned above, as is usual, as is often the case, as is reported in the newspaper等。

as在非限定性定語從句中作主語、表語或賓語，且引出的從句位置比較靈活，可位于句首或句末，也可置于主句中間。

eg. As we all know, Jack London is a famous American writer.

2. which引導的非限制性定語從句

① which指代主句中的名詞。

eg.These apple，which were bought by my father，are very sweet.

② which指代主句中的形容詞。

eg.She was very patient towards the children，which her husband seldom was.

③ which指代主句中的某個從句。

eg.He said that he will love her forever，which was not true.

以上就是今天為大家?guī)淼年P(guān)于非限制性定語從句的知識點了，是不是非常豐富呢？學好從句最重要的就是掌握好引導詞，引導詞雖然數(shù)量較多，但都有規(guī)律可循，所以大家不用著急，一點點的記住就行。