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名词性从句指的是在主句中起的作用相当于名词的从句，主要包括主语从句、宾语从句、表语从句和同位语从句。
表语从句
在句中作表语的从句称为表语从句。表语从句的引导词主要有连词that、whether、because、as if/though等；连接代词who、whom、whose、what、which、whoever、whomever、whosever、whatever、whichever等；连接副词when、where、why、how、whenever、wherever、however等。
The reason why you lost the game is that you lack confidence in yourself.
你输掉比赛的原因是你对自己缺乏信心。
The question is whether we can reduce the cost of the product.
问题是我们能否降低产品的成本。
This is what I am interested in.
这就是我所感兴趣的。
The doubt is who has got away with the document.
疑点就是谁拿走了文件。
Actually, girls can be whatever they want to be just like boys, whether it is a pilot, an astronaut or a manager.
实际上，女孩子可以和男孩子一样。想从事什么职业就从事什么职业一不管是飞行员、宇航员还是经理。
That was where we camped last time.
那就是上次我们野营的地方。
The question is how we can do the work better.
问题是我们如何才能将这项工作做得更好。
He has lung cancer. That is because he has been smoking too much.
他患有肺癌,那是因为他抽烟太多了。
特别提示
除连系动词be以外，连系动词seem、look、appear、sound等后也常出现as if/ though 引导的表语从句
It looks as if it is going to rain.
看来要下雨了。
It sounds as if you are from the south of the US.
听起来你好像来自美国南部。
It seems as if she had done a great thing.
看起来她好像做了一件大事。
1.主语为名词reason时，表语从句的引导词要用 that，一般不用why或 because
The reason for such a serious accident is that the driver was drunk.
这么严重的交通事故是由于司机醉酒驾驶造成的。
2.主句主语是advice、suggestion、order、request、requirement等名词时，表语从句的谓语动词常用 “(should+)动词原形” 形式
My suggestion is that we (should) have a discussion about this matter instead of just laying it aside.
我的建议就是我们应当讨论一下这个问题,而不应把它放在一边。
The captain's order was that we (should) start out immediately it got dawn.
船长的命令是天一亮我们就出发。
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