从句一直深受高考的青睐，一直是很多同学做完型和阅读题型的老大难问题，虽然考的多，但总有同学被它弄得晕头转向。今天给大家分享的是表语从句，一起来学习一下吧~
表语：说明主语的性质、特征、状态或身份，说明主语是什么或者怎么样。总之表语是对主语的解释和说明，是主语具体化，并且常与连系动词一起使用。 表语从句：在复合句中作表语的从句, 就叫做表语从句。表语从句一般放在系动词之后,结构是“主语+系动词+表语从句”。 ★连系动词：be动词、表示持续的系动词(keep, remain, stay)、感官动词feel(摸起来，感觉) , smell(闻起来) , sound(听起来) , taste(尝起来，吃起来) 等、表示变化的系动词(become, grow, turn, fall, get, go,)、表终止的系动词prove, turn out(结果是，证明是)、seem, appear(看起来……) 连系动词通常不用于被动语态和进行时态中。 He has become what he wanted to be ten years ago. 他已经成为了他前想成为的样子。 His suggestion is that we should stay calm. 他的建议是，我们应该保持冷静。 1.表语从句的引导词 ①从属连词 that / whether /as if /as though/as/because (1) that引导表语从句本身没有词义，在句中只起连接作用，不充当句子成分，一般不能省略。 That fact is that more than seventy percent of the earth’s surface is covered by water. 连接词that一般不能省略，但当主句中含动词do的某种形式时，that可以省略。 What I want to do is (that) I can go up to him and thank him. 我想做的事是走到身边去感谢他。 (2) whether引导表语从句表示“是否”,但不充当句子的成分。 The question is whether we can finish our work by tomorrow evening. if 与whether均意为“是否”，但引导表语从句时，只能用whether, 不能用if。 (3)as if/though“好像”，引导表语从句时要注意语态。 如果句中的情况与事实不相符，从句多用虚拟语气。如果从句表示与现在事实相反,谓语动词用一般过去式;如果从句表示与过去事实相反时,谓语动词要用“had + 过去分词 ”，如果从句表示将来的可能性不大，用would (might ,could )+动词原形。 Li Lei is now in a new jacket. He looks as if he were an American boy. (现在事实相反) The girl is giving us a vivid description of the moon. It seems as if she had been to the moon many times. (与过去事实相反) It looks as if it might rain. (与将来事实相反) 但是，如果as if/though引导的表语从句所表示的与事实相符，从句则用陈述语气。 The clouds are gathering. It looks as if is going to rain. (4) as引导表语从句 He looked just as he had looked ten years before. 他看起来还与十年前一样。 (5) because引导表语从句 常用结构：This/That/It is/was because... That is because I don’t like Chinese.
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