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定语从句讲解
1.注意英汉差异：汉语的定语无论多长都放在被修饰词的前面，而英语中的定语则不然，是一个词时，放在被修饰词的前面，如： ①.a beautiful girl ②.a lovely boy
是两个以上的词组、短语或从句则放在被修饰词的后面，如： ③.She is the girl in red. 她就是穿红衣的女孩。
④.The lady carried a bag full of money. 那位女士背了个装满钱的包。
⑤.He is the man who you are looking for. 她就是你在找的人。
2.分清主句与从句，看究竟哪个句子缺少成分。
如上面第5：
主句：He is the man
从句：who you are looking for
在从句中，looking for 的宾语是the man.因此选用关系代词 who(whom)放置于句首，便是定语从句。 3.从句中做宾语的关系代词可以省略，
故第5题可以写成：
He is the man you are looking for.
1、功能：相当于形容词，修饰名词或代词，在句中作定语 2、位置：定语从句置于被修饰词之后
Those who are willing to attend the party, sign here please. 3、先行词：被定语从句修饰的词称为先行词
（1）先行词一般是名词和不定代词，如:some-, any-, every-和no与-boy, -thing的合成词；或all、none、
any、some、that、those等代词。数词也可以作先行词，人称代词也同样可作先行词。 （2）先行词与关系词是等量关系。必须注意两点：
①先行词在从句中作主语时，从句谓语动词的数由先行词而定。 This is the place which is worth visiting.
②关系词在从句句子中充当了成分，其意思就是先行词的意义，所以在从句中不能重复其意。 There are many places we can visit（them）in China. 4、关系词：引导定语从句的都称关系词
关系代词：who, whom, which, that, whose, as.
关系副词：when, where, why. (that偶尔也作关系副词。) 5、确定关系词的步骤
（1）先找关系词，看先行词指的是什么。 （2）看关系词在从句中所充当的成分。
6、在定语从句中，当先行词指物时，下列情况的关系词宜用that而不用which
（1）先行词被①形容词最高级 ②序数词 ③数词几种词修饰或被 ④only、any、few、little、no、all、one
of等修饰时。
（2）先行词为all、much、little、none、few、one、something、anything等不定代词时。 （3）先行词中既有人又有物时。
He was looking pleasantly at te children and parcels that filled his bus. （4）先行词在主句中作表语关系词在从句中作表语时。 The village is no longer the one that was 5 years ago. （5）当主句中含有疑问词which时。 Which are the books that you bought for me ?
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7、指物时，宜用which而不用that的情况
（1）在非限制性定语从句中 （2）在关系词前有介词时 （3）当先行词本身是that时 （4）当关系词离先行词较远时
8、关系词who与that指人时，也有不同情况分别用不同的关系词
（1）当主句是there be句型时，关系词用who。
（2）先行词是为anyone、those、someone、everyone、one等词时，关系词用who。 （3）当主句是who作疑问词时，关系词用that。 Who is that girl that is standing by the window?
（4）whom在从句中只作宾语，可被who取代。
9、whose作关系词既指人又指物，在从句中作定语。如：
Do you know Mr.Smith whose story is very moving ? There is a room, whose window faces the river.
There is a room, the window of which faces the river. 10、关系代词as,在从句中作主语、宾语和表语。
（1）先行词被such/as/so/和the same修饰，或句型as many（much）中，作定语时，从句都用as 引导。
Such books as you bought are useful.
The school is just the same as it was 10 years age.
注意：区别①such/as/so … that … 及the same … that …引导的结果状语从句。They are such lovely
children that we love them much.②such/as/so … as …及the same … as … 引导定语从句。I want to use the same tool as you used just now.
（2）先行词为一句话时，定语从句用as和which引导。
区别：①意义上：as 含有“这点正如……一样”。②位置上：as 从句可置句首，也可在另处（which不能放在句首）。
He didn’t pass the exam, as we had expected.
There is lots of air in loose snow, which can keep the cold out. As is known, the earth is round, not flat.
11、关系副词when与where、why、(that)
when 指时间 = in / at / on / during which where指地点 = in / at / from / which why指原因 = for which
当先行词为way、day、reason、time时，可用that作关系副词。（非正式场合） I don’t like the way that / in which / ×he talks. 当time作先行词时，关系词可以省掉。
This is the first time I have given you a lesson in French. 12、必须注意的问题
（1）关系词作主语时，从句中谓语的数。 （2）注意区别定语从句与强调句。
①定语从句中关系词作从句成分，复合句。 ②强调句中it无意义，that / who不是引导词。
③强调句中it is / was和that / who后如果句子意思讲得通则是强调句，讲不通则不是。 （3）定语从句与同位语从句的区别。
①定语从句引导词被称为关系词，that充当主语、宾语、表语。有时可省略。 ②同位语从句引导词被叫做连词，that不能充当任何成分，不可省。 Word came that their army was defeated.(同位语)
We expressed to them our wish that was the same as their.(定语) （4）关系词在从句中省略的情况。
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①关系词作宾语，前无介词时。 ②关系词作表语。
（5）限制性定语从句与非限制性定语从句的翻译。
（6）关系词前有介词或复杂介词，关系词只能是which和whom。 （7）几个特殊的定语从句句型：
①He is the only one of the students who has got very good marks in the match.（句中one为先行词） He is one of the students who have got good marks in the match.（句中students为先行词） ②Is this place the one (that) we visited yesterday? Is this the place(that / which)we visited yesterday ?
③He stood at the window, from where he could see what was happening. ④It may rain, in which case the match will be put off.