本博文源于《语法知识清单》。所谓的名词性从句就是指句子作名词。名词可以充当那些成分,主语、宾语、表语、同位语。因此就诞生了主语从句、宾语从句、表语从句、同位语从句。
引导名词性从句的连接词可分为三类:从属连词、连接代词、连接副词。
that/whether/if 在从句中不充当任何成分,只起连接从句的功能。that没有实际意义,而whether/if有“是否”的意义。
只能用whether的情况:
连接代词指具有代词的特点,同时又能引导从句的词,主要有what,whatever,who,whoever,whom,whose,which,whichever等。这些词在从句中既作特定的成分,又有具体的含义,不能省略。
连接副词指具有副词的特点,同时又能引导从句的词,主要有when,where,how,why,whenever,wherever等。这些词在从句中既作状语,又有具体的含义,不能省略
在句中起主语作用的从句称为主语从句。引导主语从句的连接词主要有:从属连词、连接代词和连接副词。
例子:
It is obvious that you’ve made a big mistake.
It is a pity that you didn’t attend the lecture yeterday.
It is reported that no passengers were injured in the accident.
It turns out that our team has won the game.
whether引导的主语从句既可以放在句首,也可以放在句末,但if引导的主语从句只能放在句末,前面需用it作形式主语。whether,if在从句中不作任何成份,只起连接作用,不能省略,表示“是否”
在从句中不作成分,that无词义,一般不省略;whether有“是否”之意,不能换成if。
who,whom,whose,what,which,whoever,whomever,whatever,whichever等
when、where、why、how、whenever、wherever、however
because、as if 、as though。
如果主句的主语是advice,proposal,recommendation,suggestion,order,command等名词时,表语从句的谓语应用虚拟语气,即无论主语是单数或复数,谓语一律用"(should+)动词原形"的形式
同位语从句是以解释说明某一名词内容和实质的从句。
常用的连接词有:that,whether,why,who,where,how,when等.if一般不连接同位语从句。that,whether不作成分,whether表示“是否”,其他连接词具有实义,同时在同位语从句中做一定成分。同位语从句的引导词一般都不省略。
在suggestion,advice,request,order,demand,requirement等意为“建议,命令,要求”的名词后,同位语从句中的谓语动词通常用“should+动词原形”的虚拟语气结构,其中should可以省略。
跟汉语类似主要that引导,that还可以省略,省事的感觉。
The doctor said to me,“You should take plenty of water and eat more vegetables.”
===>The doctor told me that I should take plenty of water and eat more vegetables.
间接引语转化为陈述语序
He said,“Have you read this book?”
===>He asked me if/whether I had read that book.
基本句式:主语+asked/told/ordered/begged/advised+sb. to do…
The hostess said to us,“Please sit down.”
===>The hostess asked us to sit down.
“what a smart girl she is!” they praised.
==>They praised what a smart girl she was.
直接引语第一人称,间接引语第三人称,跟汉语一样,不用多注意。
转述式向前推一个时态
比如:
直接引语一般现在—》间接引语一般过去
直接引语一般过去—》间接引语过去完成
直接引语一般将来—》间接引语过去将来
直接引语现在完成—》间接引语过去完成
He said,“The story took place in the 1930s.”
===>He said that the story took place in the 1930s.
The boy said,“I found the dog just at the edge of the wood.”
===>The boy said that he found the dog just at the edge of the wood.
The reporter said,“The war in the Middle East is now still on.”
===>The reporter said that the war in the Middle East is now still on.
Our English teacher said,“All work and no play makes Jack a dull boy.”
===>Our English teacher told us that all work and no play makes Jack a dull boy.
He said,“It is many years since he came to live here.”
===> He said that it was many years since he came to live there.
He said,“You must be very fond of art.”
===>He said that I must be very fond of art.
He said,“I usually get up at 5:30 and go to school at 7:00.”
===>He said that he usually gets up at 5:30 amd goes to school at 7:00.
He said,“I met her three days ago.”
===>He said that he met her three days before.
"I’ll be coming tomorrow,"she said.
===>She said that she’ll be coming the next day.
I insisted,“You should give up smoking and drinking.”
===>I insisted that he should give up smoking and drinking.