名词性从句解析13.docVIP

（一）引导名词性从句的连接词 ?1、连接代词：who, whose, whom, what, which。有词义，在从句中担任成分，如主语、表语、宾语、或定语等。 ?2、连接副词：when, where, why, how。有词义，在从句中担任成分，作状语。 ?3、连接词：that, whether, if, as if。that 无词义，在从句中不担任成分，有时可省略；if (whether), as if虽有词义，但在从句中不担任成分。 ?注意：连接代词与连接副词在句中不再是疑问句，因而从句中谓语不用疑问式。连接代词与连接副词在从句充当句子成分，连接词whether 和if（是否），as if（好象）在从句中不充当句子成分，只起连接作用。根据句义，如果连接代词与连接副词，whether、if 和as if都用不上时，才用that作连接词（that本身无任何含义）。 that 主语从句 That从句作主语时，常用it作形式主语，常见的句型有 It be+adj(obvious,ture,natural,surprising,good,likely,funny,certain,probale......)+that 从句 It is certain that she will do well in her exam. B. It be+n(no wonder, an honor, a good thing, a pity, no surprise)+that 从句 It is no surprise that our team has won the game. C. It be +done(said,reported,thought,expected,decided....)+that从句 It is said that Mr.Green has arrived in Beijing. That在口语和非正式文件中可省，但位于句首时不可省略。 That we are invited to the concert this evening is good news to us. 宾语从句 常见的可接that从句作宾语的有see,say,know,imagine,discover,tell,show,consider....在可以接复合宾语的动词后，如think,make,consider等，可用it作形宾 He has made it clear that he will not give in. B. That从句一般不能充当介词宾语。偶尔可做except,in的宾语 He is a good student except that he is a little bit careless. He differed from his classmates in that he devoted his spare time to reading. 其他介词后需要用that 从句作宾语时，常用it做形宾。 表语从句 That引导表语从句，that 不可省略。 能接as if/as thoughHYPERLINK /view/190748.htm表语从句的系动词有：look（看起来），smell（闻起来），sound（听起来），feel（觉得）；appear（显得），seem（似乎）。 She seemed as if (though) she couldn’t understand why Laura was there 可用于“It+系动词+that从句”结构的有：seem, appear, 不可用be, look It seemed that he had made some serious mistakes in his work 能用HYPERLINK /view/345.htm不定式作HYPERLINK /view/111752.htm表语的系动词有：be, seem, get, look, appear, prove, grow. Her job is to look after the children. D. 能与there连用的系动词有：be, appear, seem. There appeared to be only one room. 同位语从句 That引导同位语从句应在某些抽象名词之后，如：fact,hope,desire,thought,suggestion,idea,news....对前面名词起补充说明的作用。That不充当任何成分。 whether，if 表语从句和同位语从句常用whether而不用if。 当主从放