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非限定性定语从句（补充说明）

限定主语：明确说的是什么，必要

非限定主语：补充说明，非必要

格式： … , who/which及介词变形where/when/why （不能用that）

  • Yesterday I met my girlfriend <who lives across the street>. （不唯一）

  • Yesterday I met my girlfriend, <who lives across the street>. （唯一）

  • David Beckham, <who modelled for a clothing company> , has earned a lot of money.

  • The mayor, <who live in this house>, has not been seen for years.

用which指代前面一整句话,并修饰一整句话​

  • She is extraordinary beautiful, <which make her roommate envy her>.
  • We ran out of money, <which bother me a l lot>.

As 引导非限定性定语从句​

  • As sb. Say …
  • As is said…
  • As we all know…,
  • As is known to all…
  • As I have told you…

The whale is not a fish but a mammal, which/as we all know.

As 位置更为灵活​

  • Disguised can sometimes be too perfect, as they soon discovered.
  • Disguised, as they soon discovered can sometimes be too perfect.
  • As they soon discovered, Disguised can sometimes be too perfect.

逗号不能连接两个完整句，只有连词/连接词才可以​

My friend showed me round the town, which was very kind of him.