四。注意事项

　　1.状语从句与其它相似结构的辨析

　　① It is/was+被强调的时间状语+ that+其它句子成分，其特点是去掉It is/was和that原句仍然成立。例如：It was at midnight that we got home。

　　② It is/was+时间+when/before+从句 表示“当……发生时，时间是……”。例如：

　　It was late evening when the doctor arrived。

　　③ It will be/was+时间段+before+句子，表示“要过……才会发生某事”或“过了……发生了某事”。例如：It will be years before we find a cure for cancer。

　　④ It is/has been + since +句子， 表示“自从……以来，时间过了……”。例如：

　　It’s three years since I last saw her。

　　2. 分隔定语从句

　　有时，定语从句不紧跟先行词之后，中间被一个插入语、状语、定语或谓语隔开。例如：

　　There is an expression in his eyes that I can’t understand。

　　For these football fans, it was an exciting moment this year, when for the first time in years their team won the world cup。

　　Do you remember one afternoon ten years ago when I came to your house to borrow a necklace?

　　The film brought the hours back to me when I was taken good care of in that faraway village。

　　Let’s go into the restaurant across the street where you can sit down。

　　3.定语从句与同位语从句的区别

　　在定语从句中，关系代词或关系副词作某种句子成分，定语从句对先行词起修饰和限制作用，而在同位语从句中，从对前面的抽象名词起补充和解释作用，连接词不在从句中充当句子成分。例如：

　　We heard the news that our school team had won the game. (同位语从句， that在从句中不作句子成分)

　　The news that he told me yesterday proves true. (定语从句， that 在从句中作told的宾语)

　　The possibilities that she was offered seemed very great. (定语从句， that 在从句中作offered的宾语)  

　　She is worried about the possibility that she might lose her job。( 同位语从句， that在从句中不作句子成分)

　　4. 定语从句与名词性从句的辨析

　　①与主语从句的辨析

　　As is known to all, the natural resources are reducing day by day. (非限制性定语从句)

　　It is known to all that the natural resources are reducing day by day. (主语从句)

　　What is known to all is that the natural resources are reducing day by day. (主语从句)

　　五。精典名题导解

　　1.(2008山东) He found it increasingly difficult to read, ______ his eyesight was beginning to fail。

　　A. though                     B. for                    C. but                          D. so

　　考点解析：前句表示一个结果，而后句表示原因，因此应填for。连词for连接的并列句总是放在后面。最佳答案为B。

　　2. (2008全国II)Stand over there, ______ you’ll be able to see the oil painting better。

　　A. but       B. till     C. and        D. or

　　考点解析：句首的祈使句和第二个分句的时态暗示空白处应填and, 构成“祈使句+and+并列句”结构。并列句表示条件，而and后的并列句表示结果。最佳答案为C。

　　3.(2008湖南) _____ the Internet is of great help. I don’t think it’s a good idea to spend too much time on it。

　　A. If         B. While           C. Because        D. As

　　考点解析：句意为：“虽然因特网非常有用，但是我认为上网花费时间太多不是好事”。连词While表示“虽然，尽管”，连接让步状语从句，最佳答案为B。      

　　4. (2008山东)You’d better not leave the medicine ______ kids can get at it. (2008山东)

　　A. even if                    B. which        C. where               D. so that

　　考点解析：句意为：“你最好不要把药品放在孩子们能拿到的地方”，空白处之前为主句，之后为状语从句，表示地点，因此应选连接词where，最佳答案为C。

　　5. (2008全国I卷) The lawyer rarely wears anything other than jeans and a T-shirt ______ the season。

　　A. whatever                  B. wherever                  C. whenever                 D. however

　　考点解析：句中含有让步状语从句whatever the season is，其中is被省略。句意为：“无论是什么季节，那个律师总是穿着牛仔裤和短袖汗衫”。最佳答案为A。

　　6.(2008湖南) When asked _____ they needed most, the kids said they wanted to feel important and loved.  

　　A. what       B. why         C. whom        D. which

　　考点解析：asked之后跟一个宾语从句，从句中的needed缺少宾语，因此空白处应填what, 最佳答案为A。

　　7.(2008天津) The last time we had great fun was _____ we were visiting the Water Park。

　　A. where        B. how         C. when         D. why

　　解析：从空白处到句末为表语从句，从句中主语、谓语、宾语齐全，但缺状语。结合句意“上次我们开心是当我们去水上乐园的时候”，因此选when, 最佳答案为C。

　　8. (2008上海) It has been proved __    _ eating vegetables in childhood helps to protect you against serious illnesses in later life。

　　A. if                     B. because                    C. when                       D. that

　　考点解析：it为形式主语，代替的是主语从句，因从句中句子成分完整，句子意义明确，因此应用that连接，最佳答案为D。

　　9. (2008上海) We went through a period _____ communications were very difficult in the rural areas。

　　A. which                 B. whose               C. in which                          D. with which

　　考点解析：句意为：“我们经历了一段时期，那时在农村通讯非常困难”。空白后为定语从句，句中为主系表结构，因此先行词a period只能作状语，表示时间，因此应选介词+关系代词in which，相当于when, 最佳答案为C。

　　10. (2008江苏) The Science Museum, ______ we visited during a recent trip to Britain, is one of London’s tourist attractions。

　　A. which               B. what                 C. that                                 D. where

　　考点解析：先行词The Science Museum在非限制性定语从句中作visited的宾语，因此只能用关系代词which，最佳答案为A。

　　11.(2008江西) Later in this chapter cases will be introduced to readers ______ consumer complaints have resulted in changes in the law.  

　　A. where             B. when            C. who           D. which

　　考点解析：作主语的先行词cases被谓语部分will be introduced to readers与定语从句分隔， 在定语从句consumer complaints have resulted in changes in the law中，主谓宾齐全，先行词只能作状语，表示“在……情况下”，应用关系副词where，最佳答案为A。

　　12. (2008陕西)The man pulled out a gold watch, _________ were made of small diamonds。

　　A. the hands of whom           B. whom the hands of

　　C. which the hands of           D. the hands of which

　　考点解析：分析句子结构可知，先行词为a gold watch，而从句的主语the hands与先行词之间为所有关系，因此应用the hands of which引导定语从句，相当于whose hands。

　　13. (2008福建)_____ is known to us all is that the 2008 Olympic Games will take place in Beijing。

　　A. It               B. What           C. As                 D. Which

　　考点解析： 分析句子结构可知，is前面是主语从句，后面是表语从句。在主语从句缺少主语，因此应填连接代词What，最佳答案为B。

　　14.(2008山东) Occasions are quite rare ______ I have the time to spend a day with my kids。

　　A. who                          B. which           C. why                  D. when

　　考点解析： 先行词Occasions被谓语部分are quite rare与定语从句分隔，从句中主谓宾齐全，先行词只能在从句中作状语，表示时间，因此空白处填关系副词when, 最佳答案为D。

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