染雾as, which 非限定性定语从句 篇一
As a student, it is important to understand the usage of non-restrictive relative clauses in writing. These clauses, also known as non-defining relative clauses, provide additional information about a noun without changing the essential meaning of the sentence. One common way to introduce a non-restrictive relative clause is by using the words "as" or "which."
For example, consider the sentence: "The book, which was recommended by my teacher, was very informative." In this sentence, the non-restrictive relative clause "which was recommended by my teacher" provides extra information about the book but does not change the fact that it is informative. The sentence would still make sense if the relative clause were removed.
Another example is: "My sister, as you may know, is a talented musician." Here, the non-restrictive relative clause "as you may know" adds information about the speaker's sister without altering the main idea of the sentence.
It is important to note that non-restrictive relative clauses are set off by commas and can be placed either before or after the noun they modify. Additionally, they are often used to provide additional details, explanations, or clarifications in a sentence.
In conclusion, understanding how to use non-restrictive relative clauses with words like "as" and "which" can enhance the clarity and complexity of your writing. By mastering this grammatical concept, you can effectively communicate additional information while maintaining the coherence of your sentences.
as, which 非限定性定语从句 篇二
When writing in English, it is crucial to master the use of non-restrictive relative clauses, which can provide valuable context and information in a sentence. These clauses, introduced by words like "as" or "which," offer additional details without changing the essential meaning of the sentence.
One common way to use non-restrictive relative clauses is to provide examples or further explanations. For instance, consider the sentence: "She finally completed her thesis, which had been a long and challenging process." Here, the non-restrictive relative clause "which had been a long and challenging process" elaborates on the completion of the thesis without altering the main idea of the sentence.
Non-restrictive relative clauses can also be used to introduce background information or set the scene for a story. For example, "As a child, she always dreamed of becoming a pilot." In this sentence, the non-restrictive relative clause "as a child" provides context about the subject's past aspirations.
Additionally, non-restrictive relative clauses are often used to add descriptive details to a sentence. For instance, "The hotel, which was located on the beach, offered stunning ocean views." Here, the non-restrictive relative clause "which was located on the beach" describes the hotel's location without changing the fact that it offers ocean views.
In conclusion, mastering the use of non-restrictive relative clauses with words like "as" and "which" can enhance the richness and depth of your writing. By incorporating these clauses effectively, you can provide additional information, context, and description to your sentences, making your writing more engaging and informative.
as, which 非限定性定语从句 篇三
as, which 非限定性定语从句
由as, which 引导的非限定性定语从句，as和which可代整个主句，相当于and this或and that。As一般放在句首，which在句中。As we know, smoking is harmful to one's health.
The sun heats the earth, which is very important to us.
典型例题
1）Alice received an invitation from her boss, ___came as a surprise.
A. it B. that C. which D. he
答案C. 此为非限定性从句，不能用 that修饰，而用which.，it 和he 都使后句成为句子，两个独立的句子不能单以逗号连接。况且选he句意不通。
2）The weather turned out to be very good, ___ was more than we could expect.
A. what B. which C. that D. it
答案B。which可代替句子，用于非限定性定语从句，而what不可。That 不能用于非限定性定语从句，it不为连词，使由逗号连接的两个句子并在一起在英语语法上行不通。
3）It rained hard yesterday, ____ prevented me from going to
A. that B. which C. as D. it
答案B.
as 和which在引导非限制性定语从句时，这两个关系代词都指主句所表达的整个意思，且在定语从句中都可以作主语和宾语。但不同之处主要有两点：
(1） as 引导的定语从句可置于句首，而which不可。
(2） as 代表前面的整个主句并在从句中作主语时，从句中的谓语必须是系动词；若为行为动词，则从句中的关系代词只能用which.。
在本题中，prevent由于是行为动词，所以正确选项应为B。
As 的`用法
例1. the same… as；such…as 中的as 是一种固定结构, 和……一样……。
I have got into the same trouble as he (has).
例2. as可引导非限制性从句，常带有'正如'。
As we know, smoking is harmful to one's health.
As is know, smoking is harmful to one's health.
As是关系代词。例1中的as作know的宾语；例2中，它充当从句的主语，谓语动词know要用被动式。
