一．定语从句相关概念
(一). 定语从句：在句子中起定语作用，修饰一个名词或代词，有时可修饰一个句子
(二). 先行词：被定语从句修饰的词
(三). 关系词：引导定语从句的词
二．关系代词的用法
(一) that 可以修饰人或事。作定语从句中可指代主语或宾语，当宾语时可以省略,但作为主语时不可以省略。
1）Is this museum the one （ that） some USA friends visited yesterday? (that作宾语可以省略)
2） The man that is standing there is my English teacher.
（作主语不可省略）
（二）which可以修饰事物，在定语从句中作主语或宾语，作宾语时可以省略
1）Tom bought a new car which made it easy for him to travel around the city.
2）This is the film (which) I like most.
（三）who 指人在定语从句中充当主语或宾语（作宾语时可以省略）
1） That is the girl who came to see you this morning.
2） The man (who) I saw in the supermarket yesterday was very handsome.
（四）whom 指代人, 在定语从句中充当宾语（作宾语时可以省略）
I've become good friends with the students (whom) I met in the English speech contest.
（五）whose 指代人和事物，表示一种所属关系。
1）The man whose name is Corrie is really proud of his son.
2）Corrie lives in the house whose windows are beautiful.
二．关系副词的用法
（一）when指时间，在定语从句中作时间状语。
1）I still remember the day when I first came to Maldives.
2）I’ll never forget the day when I joined the army.
(二) where指地点，在定语从句中作地点状语。
1）The factory where his father works is in the west of the city.
2）This is the house where I lived two years ago.
（三）why指原因,在定语从句中作原因状语。
1）That is the reason why I did the job.
2）This was the reason why we refused her invitation.
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