as...as在GRE中的考察.docx

基本用法“as + 形容词或副词原级 + as…”意为“和……一样”，表示同级的比较，但要注意第一个 as 为副词，第二个 as 为连词。根据比较对象和性质的不同又可以把此种结构分为三种：“as …as…”结构用于表示不同人或物同一性质的比较，意为“……和……一样……”例如：The tree is as tall as the building(is) ．这棵树和那栋楼一样高。注意此结构也常用于形象比喻中：as cool as cucumber 沉着冷静，泰然处之；as stubborn as a mule倔得像头骡子；as clear as crystal 像水晶一样透明；as poor as a church mouse 像教堂里面的老鼠一样穷，一贫如洗；as busy as a bee 像蜜蜂一样忙碌；as easy as ABC 像 ABC 一样容易；as deep as a well 像井一样深，难以捉摸的；as light as a feather 轻如鸿毛；as soft as butter 像黄油一样软；性格软弱注：如果是该种用法出现在填空当中，则可以将不同人或物的特性进行取同。“as …as…”结构用于表示同一个人或物不同性质的比较，意为“既……又……”例如：This swimming pool is as wide as it is long.这个游泳池宽度和长度相等。注：如果是该种用法出现在填空当中，不能直接进行取同，需要看其他对应的地方。“as …as…”结构用于表示两个人或物不同性质的比较，表示程度相同或相当，意为“……而……”。在否定句中结构是“ so/as…as…”。例如：He was as handsome as his wife was beautiful ．他长得非常英俊，他的妻子也长得非常漂亮。He was as experienced as his brother was green ．他经验丰富，而他兄弟却涉世未深。He cannot run so/as fast as you.他没你跑得快。Danny is not so/as wise as he is witty ．丹尼为人风趣，但欠明智。注：该种用法只是表示对比的两个东西程度相同，如果是该种用法出现在填空当中，不能直接进行取同，需要看其他对应的地方。“as …as…”结构的修饰语该结构根据情况可用使用以下修饰语：(not) nearly, almost, just, nothing like, exactly, not quite, half, one-ten, twice, three times, 30 per cent等，并且这些修饰语必须置于第一个as之前，而不能置于其后。如：He doesn’t play half as well as his sister. 他演奏的水平不及他姐姐的一半。This dress is twice as expensive as that. 这件连衣裙比那件贵一倍。“as …as…”结构的省略在非正式场合(尤其是美国英语中)，有时可以省略第一个as。如：When over forty, he married a woman poor as himself. 他在40多岁时娶了一个像他本人一样穷的女人。另外，若意思明确，有时可省略第二个as及其后的相关词语。如：The pianos in that shop will be cheaper, but not as good. 那家商店的收音机会便宜些，但质量没那么好。长难句分析They found that those who ate the most fast food were nearly twice as likely to be diagnosed with depression as those who ate little or none.To meet the rapidly rising market demand for fish and seafood, suppliers are growing fish twice as fast as they grow naturally, cutting their feed allotment by nearly half and raising them on special diets.Thomas Eakinss powerful style and his choices of subject--the advances in modern surgery, the discipline of sport, the strains of individuals in