定语从句

　　V.one一般有前置修饰语,有时也可有后置修饰语或不用修饰语.而 that不能有前置修饰语,但可有后置修饰语.

　　Cook was a strict but good captain,one who took good care of his sailors.

　　The water in the well is cleaner than that in the river.

　　VI.it可以替代句中的不定式或从句等,充当形式主语或形式宾语.one与that均无此用法.

　　It is known to everybody that the moon travels around the earth once every month.

　　I found it hard to get on with her.

　　VII.it与that均可以替代上文全句的内容或部分内容,而one ／ones则不可以

　　where定语从句

　　where在定语从句中的用法

　　1.先行词表示具体地点的,并在在定语从句中做状语的（不做主语,表语和宾语）,用where引导定语从句.例如：this is the house where i once lived.

　　2.先行词是表示抽象地点的如point,case,postion,condtion,activity,situation,job等,并作状语用where引导.

　　You reach a point where medicine cant help.你已到了药物无法治疗的地步.

　　Its put me in a position where I cant afford to take the job.这使我陷入一种不能接受此工作的境地.

　　She wants a job where her management skills can be put to good use.她想找一份能将她的管理技能派上用场的工作.

　　判断关系代词与关系副词

　　方法一： 用关系代词，还是关系副词完全取决于从句中的谓语动词。及物动词后面无宾语，就必须要 求用关系代词。例如：

　　（错） This is the mountain village where I visited last year.

　　（错） I will never forget the days when I spent in the countryside.

　　（对） This is the mountain village (which) I visited last year.

　　（对） I'll never forget the days (which) I spent in the countryside.

　　习惯上总把表地点或时间的名词与关系副词 where, when联系在一起。此两题错在关系词的误用上。

　　方法二： 准确判断先行词在定语从句中的成分(主、谓、宾、定、状)，也能正确选择出关系代词/关系 副词.先行词在从句中作主、定、宾语时，应选择关系代词；先行词在从句中作状语时，应选 择关系副词。

　　例如：（对）Is this the museum which you visited a few days ago?

　　（对）Is this the museum where the exhibition was held?

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