Section_Ⅲ Grammar -- 非限制性定语从句和定语从句的缩略

　　语法图解

　　探究发现

　　①She heard a terrible noise, which brought her heart into mouth.

　　②The weather turned out to be very good, which was more than we could expect.

　　③A person with his head in the clouds is a dreamer, whose mind is not in the real world.

　　④Qingdao is a beautiful city, where I'll pay a six­day visit.

　　⑤They have a son and two daughters, all of whom live in the city.

　　⑥He lived in London for two months, during which time he picked up some English.

　　⑦David, as you know, is an amateur photographer.

　　⑧He spoke to the girl (who was) from Paris.

　　⑨We said goodbye to Mr. Green, (who was) still busy at his office.

　　[我的发现]

　　(1)①～⑦句中，关系词前面均有逗号，它们为非限制性定语从句。

　　(2)⑧⑨句中都可以省略括号中的词，从而构成定语从句的缩略。

　　一、非限制性定语从句

　　1．作用

　　非限制性定语从句只是对主句内容或先行词的补充、解释或附加说明。主句与先行词或从句之间一般用逗号隔开，常常单独翻译。没有它，主句意思仍然完整。

　　2．关系代词引导的非限制性定语从句

关系代词有as, which, who, whom, whose等，作定语从句的主语、宾语、表语或定语。当先行词指人时，通常使用who, whom, whose来引导；当先行词指物时，通常使用which来引导。关系代词不可以省略。另外，that不能引导非限制性定语从句。