as…as…意为"和……一样",表示同级的比较.使用时要注意第一个as为副词,第二个as为连词.其基本用法为as+ adj./ adv.+as….例如：This film is as interesting as that one (is).这部电影和那部电影一样有趣.若有修饰成分,如twice,three times,half,a quarter等,则其必须置于第一个as之前,例如：You are not half as clever as you think you are.你可不象自己想象的那么聪明.几个关于as…as…的常见句型：（1）as…as possible/can 尽可能的 例如：Please answer my question as soon as possible.请尽快回答我的问题.（2）as…as usual/before像以前一样…… 例如：She looks as pretty as before.她看起来和以前一样漂亮 （3）as long as达……之久；和……一样长；只要（引导条件状语从句） 例如：This rope is as long as that one.这条绳子和那条一样长.（4）as far as 远至；就……而论,据…… 例如：As/So far as I know,the library won"t open until eight o"clock.据我所知,图书馆要到八点钟才开门.（5）as well as 和……一样好；也；既……又……；除……外,还…… 例如：She sings as well as she plays.她唱得好,弹得也好.
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