2016届高考英语二轮语法专项课件：定语从句（新人教版）_高考复习指南

2016届高考英语二轮语法专项课件：定语从句（新人教版）

　　(4)介词＋which/whom＋不定式结构。 The poor man has no house in which to live. ＝The poor man has no house to live in. ＝The poor man has no house in which he can live.

　　4．as和which的区别 (1)as引导的非限制性定语从句，既可在主句前，又可在主句后，有时还可插入主句中；而which引导的非限制性定语从句只能置于主句之后。相同的是两者都可替代主句的整个内容，而不是主句中的某一个词。

　　As is known to all，fish can't live without water. Smoking is harmful to our health，as we know. The weather turned out to be very good，which was more than we could expect. (2)当非限制性定语从句放在主句前面时，只能用as。 As is known to everybody，the moon travels round the earth once every month. ＝The moon travels round the earth once every month，as/which is known to everybody. ＝It is known to everybody that the moon travels round the earth once every month. ＝What is known to everybody is that the moon travels round the earth once every month.(后两句属名词性从句范畴) 另外，as多用于下列习惯用语中： as anybody can see正如人人都能看到的那样 as we had expected正如我们所预料的那样 as often happens正如经常发生的那样 as has been said before如上所述 as is mentioned above正如上面提到的 (3)当定语从句放在主句后面时，也并不是as就永远等于which。 ①当定语从句是否定句或表示否定时，只能用which。 He came here very late，which was unexpected(not expected)． Mr.Smith usually praises his student Rose in public，which she doesn't like at all. ②当as在从句中作主语时，后面常接动词的被动语态。如：be known，be said等。如果从句中行为动词是主动语态，一般用which作主语。 ③as常用在as often happens，as was said earlier，as I understand，as appears等结构中。 Jack has won the first prize，as often happens. ④as仍然保持作连词时常有的某种含义。 David is tall，as are my brothers. ⑤当非限制性定语从句的谓语后跟一个复合结构时，只能用which引导定语从句。 Betty always tells a lie，which her parents feel strange. 二、关系副词的用法 1．当先行词在定语从句中作状语时，要用关系副词。 I still remember the day when I first came to Beijing.(when＝on which) Can you tell me the office where he works？(where＝in which)