2．from where也可以引导定语从句。

　　We stood at the top of the hill, from where we can see the whole town.

　　我们站在山顶上，从那里可以看到整个城镇。

　　　3

　　①(天津高考改编)English is a language shared by several diverse cultures, each of which uses it differently.

　　②(浙江高考改编)The children, all of whom had played the whole day long, were worn out.

　　四、使用非限制性定语从句时需注意的问题

　　1．that 不能用于引导非限制性定语从句。

　　2．非限制性定语从句还能将整个主句作为先行词，对其进行修饰，这时从句谓语动词要用第三人称单数。

　　3．非限制性定语从句中，不用 why 引导，用 for which 代替 why。

　　4．先行词为独一无二的物体时，一般用非限制性定语从句。

　　The sun, which rises in the east, gives us light and heat.

　　太阳从东边升起，给我们光和热。

　　The Great Wall, which is called in Chinese "The Ten­Thousand Li Great Wall"， is actually more than 6,000 kilometers.

　　长城，中国人称作"万里长城"，实际不只有6,000千米。

　　Ⅰ.用非限制性定语从句连接两个句子

　　1．She has two daughters; they both married rich men.

　　→She_has_two_daughters,_who_both_married_rich_men.

　　2．He visited the Great Wall again. He went there two years ago.

　　→He_visited_the_Great_Wall_again,_where_he_went_two_years_ago.

　　3．He failed in the examination. It made his father very angry.

　　→He_failed_in_the_examination,_which_made_his_father_very_angry.

　　4．He must be from Africa. It can be seen from his skin.

　　→He_must_be_from_Africa,_which/as_can_be_seen_from_his_skin.

　　5．He has two sons. Both of them work as chemists.

　　→He_has_two_sons,_both_of_whom_work_as_chemists.

　　6．He is a man of great experience. Much can be learned from him.

　　→He_is_a_man_of_great_experience,_from_whom_much_can_be_learned.

Ⅱ.用定语从句完成句子