|
③ 作“如 (不如)……一样”解，引导方式状语从句或比较状语从句。He does not speak as the other people do. 他不像其他人那样肯说话。He is not so diligent as you. 他不如你勤奋。(so…as…只用于否定句。若为肯定句必须用as…as…) ④引导让步状语从句时，作“虽然”、“尽管” 解，这时，要将表语或状语提到主语之前，使句子部分倒装。如果表语是名词，放在句首时不能加冠词。Young as he is, he knows a lot. 尽管年轻，他懂得很多。Old man as he is, he still works hard. 尽管他是个老人，他仍然工作很努力。 (2) as用作代词 ① 作关系代词，引导限制性定语从句，先行词前常有such，the same与之呼应，构成such...as，the same (…) as…。We'll make such computers as are needed in different branches of science. 我们将制造出科学的各部门所需要的那种计算机。/ I'm reading the same books as you. 我读的书与你读的书相同。 ②引导非限制性定语从句，as常常作主语、定语、表语等，在这种情况下as指的是前面或后面的整个句子。The two cities are far away from each other, as you can see in the map. 正如你在地图上看见的那样，这两座城市相距甚远。/ As everybody knows, all that glitters is not gold. 大家都知道，闪光的东西不都是金子。 3) as if (as though) 用作连词，作“就像…似的”“仿佛”解 (1) as if (as though)引起的方式状语从句或表语从句中动词一般用虚拟语气, be通常为were或was。如从句动作与主句动作同时发生，从句用一般过去时；若从句动作在主句动作之前发生，从句用过去完成时。Jane shouted in surprise as if she saw the land. 珍妮惊喊着，好像看见了陆地。/ Tom is talking about China as if he had been there. 汤姆正在谈着中国，好像他去过一样。 (2)若主句谓语动词为look，seem，taste，smell等词时，as if引导的表语从句常常使用陈述语气。 It looks as if it is going to rain. 看起来天好像耍下雨。/ This meat tastes as if it has already gone bad. 这肉尝起来好像已变坏了。 (3)当从句中主语和句子主语一致，从句谓语又包含动词be时，这个主语和be可以省略。He glanced about as if (he was) in search of something. 他四处打量着好像在搜寻什么。 (4) as if (as though)可以接一个不定式短语。He waved his hand to me as if to have something to tell me. 他向我挥了挥手好像有事要告诉我。 辨析：as，when与while as，when，while作为连词，都有“当……的时候”的意思。* as常可与when或while通用，但它较强调主句和从句中的动作或事情同时发生。因此，常作“一面……一面……”解。 * while常表示一段较长的时间或一个过程，强调主句的动词和从句的动词所表示的动作或状态是同时发生的。用while引导的从句中用延续性动词。 (责任编辑：admin) |