[10-20 18:11:12] 来源:http://www.67xuexi.com 高一英语 阅读:85689次
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①as引导的非限制性定语从句可以放在主句前面、插在主句中间或放在主句末尾;而which引导的非限制性定语从句只能放在主句后面。
He married her, as/which was natural. =As was natural, he married her. Mark Twin is a great writer, which/as is known to all. =As is known to all, Mark Twin is a great writer.
②as引导的从句有“正如”、“正像”之意,而which则无此意。
常用句型有:
as we all know, as is known to all, as everybody can see, as is expected, As is known/ said/ reported/ told/ we all know等。
如:
As we all know, paper was first made in China. To shut your eyes to facts, as many of you do, is foolish.
③主句和从句有因果关系时,用which. Our class has won the football match, which made us very happy.
Bamboos are hollow, which makes them very light.
④从句含否定意义时常用which.
She didn’t pass the exam, which we couldn’t expect.
She didn’t pass the exam, as we expected.
6.when关系副词:指时间。在定语从句中作时间状语,不能省略。此时的when还可用介词+which替换(此时先行词一定是表时间的名词)。
I still remember the time when I joined the League.
=I still remember the time on which I joined the League.
=I still remember the time (which/that) I joined the League on.
7.where关系副词:指地点。在定语从句中作地点状语,不能省略。此时的when还可用介词+which替换(此时先行词一定是表地点的名词)。
I still remember the school where I joined the League.
=I still remember the school in which I joined the League.
=I still remember the school (which/that) I joined the League in.
※注:对关系副词when, where的认识。
①。 先行词是时间的名词,并非都用关系副词when引导定语从句。
I’ll never forget the time (which/that) I spent in Beijing.
②。 先行词是地点的名词,并非都用关系副词where引导定语从句。
This is the factory (which/that) he visited yesterday.
③。 当句型为It/This/That is(was) the first(second…last) time引起的句子时用that连接其后的句子。此时的time是次数,不是时间。
It/This is the first time that we travel.
It/This is the last time that I shall give you a lesson.
8. why指原因,在定语从句中作原因状语,先行词通常为reason,不能省略。且why引导的定语从句只能是限定性定语从句。
Why= for which I don’t know the reason why he was late yesterday.
The reason why(for which) he was late is that he missed the bus.
※注:当先行词为reason时,关系副词并非都用why。
This is the reason (that/ which) he gave/ explained to us.
【判断用关系代词还是关系副词】
从句缺少的是主语、宾语还是状语是确定用关系代词还是关系副词的关键。
试比较:
I will never forget the day (which/that) I spent in Hongkong. ( spent是及物动词,后缺宾语,因此用关系代词或省略 )
I will never forget the day when/on which Hongkong returned to its motherland. ( 从句主谓宾结构完整,缺状语,因此用关系副词或介词加关系代词 )
The reason (that/which)he gave for not coming to school yesterday isn’t believable. ( gave是及物动词,后缺宾语,因此用关系代词或省略 )
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