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1、学习好资料 欢迎下载 名词性从句的连接词选用 名词性从句包括主语从句，表语从句，宾语从句和同位语从句引导同位语从句的词通有连词 that，whether，连接副词 how,when,where等。（注：if 不能引导同位语从句。）。在各种考试中，其最主要的考查内容为连接词的选用。名词性从句的连接词可细分为以下四种：（1）以 that 来引导从句；（2）以 whether/if 引导从句；（3）以特殊疑问词引导从句；（4）以关系代词/副词引导从句。一、以 that 引导从句 当从句的意思已完整时，名词性从句用 that 引导，that 在从句中不作任何句子成分，仅起连接作用。如：It is ce
2、rtain that he will do well in his new job.（主语从句）Do you know that he has been admitted to Beijing University?（宾语从句）My decision is that we are to start at 6 tomorrow morning.（表语从句）The news that our team had won the game excited everybody.（同位语从句）当用 that 引导从句时，需注意以下情况：1在主语从句中，that 一般不可省略，尤其是当主语从句位于句首时，它
3、绝对不可省略。如：That our team had won the game was good news to us.2在宾语从句中，that 可省略。但当句中有两个并列的宾语从句时，引导第二个宾语从句的 that 不可省略。如：Everybody knows(that)the earth goes round the sun.Everyone knew what happened and that she was worried.3当句子是以 it 作形式宾语时，引导宾语从句的 that 不可省略。如：He has made it clear that he will not give i
4、n.4that 一般不能引导介词的宾语从句，偶尔可在 except,but,besides 和 in（在于；在方面）的后面引导宾语从句，that 不可省略。如：Your homework is quite good except that you have made two small mistakes.The reason lies in that she works harder than the others do.He differed from other people in that he always looked farther ahead in his work.在其它介词后
5、面需要用 that 引导宾语从句时，必须用 it 作形式宾语。如：You may depend on it that I shall always help you.5在表语从句和同位语从句中，that 不可省略。如：My advice is that you must give up smoking right now.The fact that he is a thief shocked all of us.二、以 whether/if 引导从句 引导名词性从句的 whether/if 意为“是否”。在使用时，要注意两者存在以下区别。1在主语从句中，whether 既可引导位于句首的主语从
6、句，也可引导用 it 作形式主语的主语从句，而 if 只能引导以 it 作形式主语的主语从句。如：Whether the work can be completed on time is doubtful.It is doubtful whether/if the work can be completed on time.2在宾语从句中，当其后紧跟 or not 时，只能用 whether，不能用 if。如：I dont care whether/if he comes or not.I dont care whether or not he comes.3在介词后面的宾语从句中，只能用 w
7、hether，不能用 if。如：It all depends on whether they will come back.学习好资料 欢迎下载 4在表语从句和同位语从句中，只能用 whether，不能用 if。如：The problem is whether the money will be enough.I have no idea whether the money will be enough.三、以特殊疑问词引导从句 英语中所有用来构成特殊疑问句的特殊疑问词均可以用来引导名词性从句，其选择取决于从句句意的需要。如：It remained unknown who（谁）let out
8、the news.I dont know what（什么）I was thinking of.The problem is where（哪里）we should stay.My question how（怎样）I shall get in touch with him has not been answered.选择特殊疑问词需注意的情况：1要注意特殊疑问词在从句中所担当的句子成分：疑问代词可作主语、宾语和表语，而疑问副词（where,when,why,how）只能作状语。如：I cant imagine who did it.（作主语）I cant imagine how he did it
9、.（作状语）2Who 在从句中既能作主语，也能作宾语，而 whom 只能作宾语。如：It hasnt been decided who will manage the company.They havent decided whom they should help.四、以关系词引导从句 用关系词引导的名词性从句又可称作名词性关系从句，因为它实际上是先行词与在其后的定语从句的结合。引导这种名词性从句的关系词有：what(=the thing that),whoever(=anyone who),whichever(=anyone/anything that),where(=the place
10、where),when(=the time when)等。如：What they need is a good rest.I can judge by what I know of him.Whoever did this job must be rewarded.Whichever he likes will be given to him.We shall not forget when the meeting will be held.She walked up to where he stood.用关系词引导名词性从句时需要注意 wh-ever 与 no matter wh-的区别。W
11、h-ever既可引导名词性从句，又可引导让步状语从句；而 no matter wh-只能引导让步状语从句。如：Whatever I said,he wouldn t listen to me.(=No matter what I said,he wouldnt listen to me.)（引导让步状语从句）He would believe whatever I said.（引导宾语从句）Whichever/No matter which you choose,the others will be offended.Take whichever you like.这里句中的 whichever
12、 在不能用 no matter what 替换 最后，关于名词性从句的连接词要指出的是，根据句意，引导表语从句的还可以是 as if/as though,because,as。如：It looks/seems as if its going to rain.It was because I got up late.Things were not as they seemed to be.但是，当 reason 作主句的主语时，引导表语从句只能用 that，如：The reason for my absence was that I was ill.语从句的词通有连词连接副词等注不能引导同位语从句在各种考试中其最主要的考查内容为连接词的选用名词性从句的连接词可细分为以下四种以来引导从句以引导从句以特殊疑问词引导从句以关系代词副词引导从句一以引导从句同位语从句当用引导从句时需注意以下情况在主语从句中一般不可省略尤其是当主语从句位于句首时它绝对不可省略如在宾语从句中可省略但当句中有两个并列的宾语从句时引导第二个宾语从句的不可省略如当句子是以作形式宾语如在其它介词后面需要用引导宾语从句时必须用作形式宾语如在表语从句和同位语从句中不可省略如二以引导从句引导名词性从句的意为是否在使用时要注意两者存在以下区别在主语从句中既可引导位于句首的主语从句可引导用作