如何选择定语从句的引导词?*限制性定语从句限制性定语从句修饰先行词，对先行词起修饰作用，紧接先行词之后，无逗号，若省去，原句意思不完整。
引导定语从句的关系代词有who,whom,whose,which,that等。
who,whom,whose用于指人，whose有时也可指物，相当于of which；which用于指物；that 既可指人也可指物，但只用于限制性定语从句中。
关系代词除了引导定语从句，替代先行词外，还在从句中担任主语、宾语、定语等。
*非限制性定语从句非限制性定语从句既可修饰先行词，也可修饰整个主句，起补充说明作用，与主句之间有逗号隔开，若省去，原句意思不受影响。
不可用that引导非限制性定语从句。
关系词不可省略。
一、定语从句的引导词有关系代词who，whom，whose，which，that，as；关系副词when，where，why。
定语从句中引导词的选用主要看先行词在定语从句中作什么成分或者是定语从句中缺什么成分。
1．定语从句中缺主语，修饰人时用who ／that，修饰物时用which ／that引导。
如：Is this the factory which ／that makes TV sets？The man who ／that visited our school is from Australia．2．从句中缺宾语，修饰人时用who ／whom ／that或省略引导词；修饰物时用which ／that或省略引导词。
如：Gone are the days which ／that we spent together in the village．He is the man who ／whom ／that I think to be worthy of our praise．3．从句中缺时间状语，用when或介词＋which引导。
如：The day finally came when ／on which I was given a job．We'll put off the outing until next week，when we won't be so busy．4．从句中缺地点状语，用where或介词＋which引导。
如：Please put the letter on the desk where ／on which he can easily find it．5．从句中缺原因状语或先行词是reason时，引导词用why ／for which ／that。
如：This is the reason why ／for which ／that he didn't come to the meeting．6．从句中缺定语，人和物都用whose引导。
如：A child whose parents are dead is called an orphan．Please pass me the dictionary whose cover is black．7．当先行词是way时，其定语从句的引导词用in which ／that。
如：The way in which ／that he looks at problems is wrong．二、引导词as可引导限制性定语从句，也可引导非限制性定语从句。
1．在固定词组the same．．．as，such．．．as中，as引导限制性定语从句。
如：He is not such a fool as he looks．I've bought the same dress as she is wearing．2．当先行词是整个主句时，可用as ／which引导非限制性定语从句。
引导词as和which 的区别在于：①as引导的非限制性定语从句可放于主句前、主句中、主句后，而which引导的非限制性定语从句一般放于主句后或句中。
②as常与从句中的know，see，hear，expect等动词连用，也常用于as often happens，as is often the case（常有的事）等句子中；而which一般不用于以上情况。
③as有“正如”的含义，which没有此含义。
如：As is well known，Shanghai is a big city．Some of the roads were flooded，which made our journey more difficult．三、关系代词who，whom，whose，which和as能引导非限制性定语从句，而that不能；非限制性定语从句中即使缺宾语，引导词也不能省略；关系副词when，where能引导非限制性定语从句，而why不能。
如：Abraham Lincoln，who led the United States through the Civil War years，was shot on April 14，1865．四、先行词是物时，其引导词可用which也可用that，通常情况下二者可互换，但在有些情况下不能。
1．用which不用that引导定语从句的三种情况：①非限制性定语从句用which，不用that引导。
如：Football，which is a very interesting game，is played all over the world．②先行词为that时，为了避免重复，定语从句用which不用that引导。
如：That which you borrowed from me wasn't a real diamond necklace．③介词后用which不用that引导。
如：The method with which you solved the problem is very good．2．用that不用which的七种情况：①先行词前有形容词最高级或序数词修饰时，用that不用which引导。
如：This is the best place that I have ever visited．The second question that is asked is why we don't fall off the earth．②先行词为little，much，all，none，few，（the）one，something，everything，nothing，anything等不定代词时，用that引导。
如：There is nothing in the world that can frighten him．③先行词既有指人的名词又有指物的名词时，用that引导。
如：He told us about the people and the cities that he had visited．④先行词前有any，all，no，few，every，some，little，much，（the）very，（the）only，（the）last等词修饰时，用that引导。
如：This is the very coat that I need．Is oxygen the only gas that helps fire burn？⑤先行词为which时，为了避免重复，用that引导。
如：Which is the book that you bought yesterday？⑥先行词在从句中作表语时，常用that引导。
如：Shanghai is no longer the city that it used to be in the 1930's．⑦当主句是There be．．．句型时，用that引导。
There are two tickets for the film that are for you two．五、在“one of＋复数名词＋定语从句”结构中，从句的谓语动词应与复数名词保持一致；当one前有the only修饰时，从句的谓语动词应与the only one保持一致。
如：He was one of the students who were late for class．He was the only one of the students who was late for class．六、引导词前有介词或短语介词时，修饰人只能用whom，修饰物只能用which引导。
如：My glasses，without which I was like a blind man，fell to the ground and broke．The man，by whom the wolf was shot，is called Jackson．1. who（主格）先行词指人，在定语从句中作主语。
Whom（宾语）先行词指人，定语从句中作宾语。
例句：Is he the man who wants to see you？He is the man （whom）I saw in the reading room yesterday。
（whom作宾语时可省略）2. whose 先行词指人或指物，且只作定语，若指物，可与of which互换。
例句：That is a book whose cover（of which the cover）is red。
3. which 先行词指物，在从句中可作主语，宾语。
例句：The bag which is on the desk is mine.4. that 几乎是万能胶……能代替上述3个引导词，可做主语，宾语。
在此不再举例.that的特殊用法：A There be句型中用that不用whichB 在不定代词（something，anything，all，few，any等）后用that，不用which（something后也可用which）C 先行词有all，every，some，any，only，few或序数词，形容词最高级修饰时，只用thatD 先行词既指人又指物时，用thatE 先行词被the only，the very，the last修饰时，用thatF 避免关联词重复，用thatG 用作关系副词，修饰表示时间的名词（day ，time ，moment……）that可替代when5.when，where，why的先行词是指时间地点和理由的名词，先行词在从句中做状语.能与介词+ which互换.54. The Beatles, __________ many of you are old enough to remember, came from Liverpool. (2006天津卷)A. whatB. thatC. howD. as55. The owner of the cinema needed to make a lot of improvements and employ more people to keep it running, __________ meant spending tens of thousands of pounds. (2006江苏卷)A. whoB. thatC. asD. which56. Women __________ drink more than two cups of coffee a day have a greater chance of having heart disease than those __________ don’t. (2006北京卷)A. who; 不填B. 不填; whoC. who; whoD. 不填; 不填57. Look out! Don’t get too close to the house __________ roof is under repair. (2006福建卷)A. whoseB. whichC. of whichD. what58. We saw several natives advancing towards our party, and one of them came up to us, __________ we gave some bells and glasses. (2006湖南卷)A. to whichB. to whomC. with whomD. with which59. I was told that there were about 50 foreign students __________ Chinese in the school, most __________were from Germany. (2006辽宁卷)A. study; of whomB. study; of themC. studying; of themD. studying; of whom60. We’re just trying to reach a point __________ both sides will sit down together and talk. (2006山东卷)A. whereB. thatC. whenD. which61. She was educated at Beijing University, __________ she went on to have her advanced study abroad. (2006陕西卷)A. after whichB. from whichC. from thatD. after that62. I was given three books on cooking, the first __________ I really enjoyed. (2006浙江卷)A. of thatB. of whichC. thatD. which63. I saw a woman running toward me in the dark. Before I could recognize who she was, she had run back in the direction __________ she had come. (2006重庆卷)A. of whichB. by whichC. in whichD. from which64. You can find whatever you need at the shopping centre, __________ is always busy at the weekend. (2006上海卷)A. thatB. whereC. whatD. which65. Do you have anything to say for yourselves?—Yes, there’s one point __________ we must insist on. (2006江西卷)A. whyB. whereC. howD. /66. Last week, only two people came to look at the house, __________ wanted to buy it. (2007安徽卷)A. none of themB. both of themC. none of whomD. neither of whom67. We shouldn’t spent our money testing so many people, most of __________ are healthy. (2007北京卷)A. thatB. whichC. whatD. whom68. The village has developed a lot __________ we learned farming two years ago. (2007福建卷)A. whenB. whichC. thatD. where69. By serving others, a person focuses on someone other than himself or herself,__________ can be very eye-opening and rewarding. (2007湖南卷)A. whoB. whichC. whatD. that70. He was educated at the local high school, __________ he went on to Beijing University. (2007江苏卷)A. after whichB. after thatC. in whichD. in that71. After graduation she reached a point in her career __________ she had to decide what to do. (2007江西卷)A. thatB. whatC. whichD. where72. Some pre-school children go to a day-care center, __________ they learn simple games and songs. (2007全国I)A. thenB. thereC. whileD. where73. —Where did you get to know her?—It was on the farm __________ we worked. (2007山东卷)A. thatB. thereC. whichD. where74. The book was written in 1946, __________ the education system has witnessed great charges. (2007山东卷)A. whenB. during whichC. since thenD. since when75. Today, we’ll discuss a number of cases __________ beginners of English fail to use the language properly. (2007陕西卷)A. whichB. asC. whyD. where76. It is reported that two schools, __________ are being built in my hometown, will open next year. (2007四川卷)A. they bothB. which bothC. both of themD. both of which77. Those successful deaf dancers think that dancing is an activity __________ sight matters more than hearing. (2007天津卷)A. whenB. whoseC. whichD. where78. Chan’s restaurant on Baker Street, __________ used to be poorly run, is now a successful business. (2007浙江卷)A. thatB. whichC. whoD. where79. Human facial expressions differ from those of animals in the degree __________ they can be controlled on purpose. (2007重庆卷)A. with whichB. to whichC. of whichD. for which【答案与详解】1—53 （略）54. D。