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1、英语中几大从句的用法总结⒈主语从句 ⑴主语从句可直接位于主语的位置，如果从句较长，谓语又较短，可用it作形式主语，而将从句放在句末。常见的句型有：*It is a facta pitya questiongood news that...*It seemsappearshappenedhas turned out that...*It is clearimportantlikelypossible that...*It is saidreportedestimatedhas been prov
2、ed that...*It is said that comic books create a connection between people of the same generation.*It seems that the performance is very useful.⑵what引导的主语从句表示“...的东西时”，一般不用it作形式主语。*What we lack is experience.⑶what,who,when,why,whether等词含有各自的疑问意义，但它们引导的主语从句，都用陈述语
3、序。*How the plan is to be carried out should be discussed again.*I did know why I felt like crying.⒉宾语从句⑴宾语从句可位于及物动词、介词和某些形容词后。连词that常可省略。介词后一般接疑问词引导的宾语从句。in that(因为),except that(除了),but that(只是）已构成固定搭配，其他介词后一般不接that引导的宾语从句。*I promised that I would change the si
4、tuation.*All this is different from what American young people would say about friendship.*He is certain that watching so much television is not good for children.*This article is well-written except that it is a bit too long.⑵宾语从句后如有宾补，要用形式宾语it来代替，而把宾语从
5、句移至宾补之后。*He has made it clear that he would not change his mind.⑶在think,believe,suppose,expect等动词后的宾语从句中，如果谓语是否定的，一般将否定词移至主句谓语上，宾语从句则变成肯定形式。*He didn't think that the money was well spent.⒊表语从句⑴表语从句出现在结构为“主语+系动词+表语从句”的句子中。表语从句除可用that,what,when,why,whether,how等引导
6、外，还可由because,as if(though)等引导。that常可省略。如主句主语为reason,只能用that引导表语从句，不可用because.*Perhaps the most important thing to remember is that there is noone common type of life in America.*The reason why so many people died there is that there were not enough food supplie
7、s.*It looks as if successful international cultural communication will make the world smaller.⑵宾语从句后如有宾补，要用形式宾语it来代替，而把宾语从句移至宾补之后。 *He has made it clear that he would not change his mind.4.同位语从句 同位语从句用于对前面出现的名词作进一步说明，一般用连词that引导，由于先行名词的意义不同，也可用whether/who/when/
8、Where/what/why/how等引导。常见的先行名词有fact/idea/Belief/news/hope/conclusion/evidence/suggestion/order/Problem/report,/decision.有时由于谓语较短，将同位语从句位于谓语之后。 *She finally made the decision
