本次英语语法专题我们学习“表语从句”，具体内容如下：
在句中作表语的从句称为表语从句。能引导宾语从句的连接词皆可引导表语从句。可以引导宾语从句的连接词主要有that类，whether类，wh-类，as/as if/as though类，because类。
一、that类表语从句
例句：Their breakthrough,simply put,was thatwhen their search engine scrawled the Web,it did more than just look got word matches.
简单地说，他们的突破在于：当他们的搜索引擎在网上搜索时，不仅仅是寻找相匹配的词语。
例句：The reason for his absence is that his daughter suddenly fell ill.
他缺席的原因时他的女儿突然病了。
注意！主语是表示“计划、建议、要求、命令”的词，如suggestion，advice，order，demand等时，表语从句的谓语动词常用“should+动词原形”，should可以省略。
例句：My advice is that you (should) think it over before you make a decision.
我的建议就是你作出决定之前要三思。
It seems/appears that...句式，有人认为that引导的是主语从句，有人认为是表语从句。
例句：It seems that Mary is not coming to the party at all.
玛丽似乎不会来参加聚会。
例句：It seems to me that we should answer for this.
在我看来，我们似乎应该对此事负责。
二、whether类表语从句
例句：The real space race is whetherwe will continue off Earth on to other worlds before money for the space programme runs out.
真正的太空竞赛在于，我们能否在太空项目的资金用完之前离开地球，到其他星球上进行殖民活动。
例句：The problem is whetherthe new plan can be put into practice.
问题是新的计划能否实行。
例句：The question remains whetherthey will be able to help us.
问题还是他们能否帮我们。
三、wh-词类表语从句
Wh-词包括连接代词who，whom，whose，what，which，whoever，whatever，whichever等和连接副词where，when，how，why，wherever，whenever等。词类词大多数表示疑问，偶尔表示陈述。
例句：The problem is whowe can get to go to the airport to pick her up.
问题是我们能找到谁去机场接她。
例句：That"s whatwe are here for.
我们来这里就是为了这。
例句：The question is howwe can persuade him to go with me.
问题是我们如何才能说服他和我一起去。
例句：This was wherewe hold the dance party last time.
这就是上次我们举办舞会的地方。
例句：The question is howeverwe can do the work better.
问题是我们究竟如何才能将这项工作做得更好。
例句：That"s whyhe was late for school.
这就是他上学迟到的原因。
四、as/as if/as though类表语从句
此类表语从句常跟在特定动词后面，如seem，appear，look，taste，sound，feel等。
例句：It sounds as ifsomeone is knocking at the door.
听上去好像有人在敲门。
例句：He lookedjust as he had looked ten years before.
他看起来还跟十年前一样。
注意！As if/as though引导表语从句时，在表示与事实不符的情况下用虚拟语气。
例句：It looks as if she had understood the question.
看上去她好像理解了这个问题了。（事实是她未理解）
例句：It appears as if he hadn"t met her.
好像他从未见过她。（事实是他见过她）
五、because类表语从句
例句：Hubert never experienced any fear,and this was partly becausehe was hot particularly intelligent.
休伯特从来都没有害怕的感觉，部分原因是他这个人表示特别聪明。
例句：That"s becausequickly growing energy demand requires immense investment in new supply,not to mention the drain of rising energy prices.
那是因为迅速增长的能量需求要求大幅度增加对新供应的投资，更不用提不断上升的能源价格带来的消耗。
以上就是“表语从句”的内容，咱们一定要结合例句学习句法和语法，这样更容易理解和实操英语！
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