为什么This is the reason （that） he is late为什么（）可以用that 或不填什么是同位语从句

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为什么Thisisthereason（that）heislate为什么（）可以用that或不填什么是同位语从句为什么Thisisthereason（that）heislate为什么（）可以用that或

为什么This is the reason （that） he is late为什么（）可以用that 或不填什么是同位语从句
为什么This is the reason （that） he is late
为什么（）可以用that 或不填
什么是同位语从句

为什么This is the reason （that） he is late为什么（）可以用that 或不填什么是同位语从句
这不是同位语从句,是定语从句.这里也可以用关系副词why.
同位语从句是用来解释先行词的内容的,定语从句是用来修饰先行词的.试举例：
It is a fact that she has done her best.
It is a fact that you can't deny.
前一句是同位语从句,fact事实的内容是她已经尽了最大努力了.
第二句是定语从句,这是一个你不能否认的事实.但事实的内容是什么?从这句子看不出来,只知道是一个不能否认的事实.
从语法上讲,同位语从句的先行词一般是抽象名词,如news,idea,information,hope,rumour,conclusion...定语从句无此限制.另外,在中学阶段,同位语从句的连接词一般是that,不可省略,that在句中无成分,无意义.

that引导同位语，在从句中不作任何成分。

这个句子不是同位语从句，因为同位语从句的that是不能省略的。例：This is the reason (that) he is late is THAT his clock was broken.这个句子中的第二个that后面跟的才是同位语从句。（）可以省略的原因是that在句子中不作任何成分，所以可以省略。

应该把它看成同位语从句,that可以省略

什么是run-on sentenceObviously,the problem of greenhouse effect is one of the biggest problems that had many big conferences between countries to discussed it today,the movie is just magnifying the effect of this problem in order to lead the reaso This is the ( )area.(geography)为什么? This is the tree.为什么要用the This is the worst film 为什么用worst Is this the room he lives?这个句子对不对?为什么? this is his most important novel为什么不是the most this is the new This is the this is the THIS IS THE WAY This is the this is the last This is the This is the this is the RT... this is the computer which is the most expensive in the store.不对为什么? this is kangkang.为什么用this is This is the university _________?This is the university at which do we study.和This is the university where we study at.哪句是对的?为什么?