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非限定性定语从句讲解
非限定性定语从句讲解:
非限定性定语从句概述
形式:在非限定性定语从句的前面往往有逗号隔开,将非限定性定语从句放在句子中间,其前后都需要用逗号隔开。
作用:非限定性定语从句起补充说明作用,缺少也不会影响全句的理解。非限制性定语从句是先行词的附加说明,去掉了也不会影响主句的意思。
关系代词
引导非限定性定语从句的关系代词:as, which,who,whom,whose;
who引导
My gardener,who is very pessimistic,says that there will be no apples this year.
我家的园丁非常悲观,他说今年将不结苹果。
whom引导
关系代词whom用于指人,在句中作动词宾语和介词宾语,作介词宾语时,介词可位于句首。
如:Peter, whom you met in London, is now back in Paris.
彼得现在回巴黎了,你在伦敦见过他。
Mr. Smith, from whom I have learned a lot,is a famous scientist.
史密斯先生是一位著名的科学家,我从他那儿学了许多东西。
whose引导
whose是关系代词who的所有格形式,在从句中作定语。whose通常指人,也可指动物或无生命的事物。
如:The boy, whose father is an engineer, studies very hard.
那位父亲是位工程师小男孩学习很努力.
Above the trees are the mountains, whose magnificence the river faithfully reflects on the surface.
在树林的高处是山,其壮丽的景色完全映照在河面上。
which引导
关系代词which在非限制性定语从句中所指代和修饰的可以是主句中的名词、形容词、短语、其他从句或整个主句,在从句中作主语、动词宾语、介词宾语或表语。
① which指代主句中的名词,被指代的名词包括表示物、婴儿或动物的名词、表示单数意义的集体名词以及表示职业、品格等的.名词。
如:These apple trees,which I planted three years ago,have not borne any fruit.
这些苹果树是我三年前栽的,还没有结过果实。
② which指代主句中的形容词。
如:She was very patient towards the children,which her husband seldom was.
她对孩子们很耐心,她丈夫却很少这样。
③ which指代主句中的某个从句。
如:He said that he had never seen her before,which was not true.
他说以前从没见过她,这不是真的。
④ which指代整个主句。
如:In the presence of so many people he was little tense, which was understandable.
在那么多人面前他有点紧张,这是可以理解的。
关系副词
when,where,why;
when引导
关系副词when在非限制性定语从句中作时间状语,指代主句中表示时间的词语。
如:He will put off the picnic until May 1st, when he will be free.
他将把郊游推迟到5月1号,那时他将有空。
where引导
副词where在非限制性定语从句中作地点状语,指代主句中表示地点的词语。
如:They went to London,where they lived for six months.
他们去了伦敦,在那儿呆了六个月的时间。
as引导的非限制性定语从句
as引出非限定性定语从句时,代替整个主句,对其进行说明但通常用于像as we all know, as it is known, as is known to all, as it is, as is said above, as always mentioned above, as is usual, as is often the case, as is reported in the newspaper等句式中。as在非限定性定语从句中作主语、表语或宾语,且引出的从句位置比较灵活,可位于句首或句末,也可置于主句中间。通常均由逗号将其与主句隔开。as有“正如……,就像……”之意。
如:As is known to the United States, Mark Twain is a great American writer.
美国人都知道,马克·吐温是一位伟大的美国作家。
(as在从句中作主语)
He is absorbed in work, as he often was.
他正在全神贯注地工作,他过去经常这样。
(as在从句中作表语)
As we all know, the earth is round.
众所周知,地球是圆的。
(as在从句中作宾语)
特殊结构
“名词/代词+of + which / whom”
Light is the fast thingin the world, the speed of which is 300000 kilometer per second.
光是世界上最快的东西,它的速度是每秒30万千米。