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1、as ...as 表示“和...一样”之意；用于同级比较时,既可用于肯定中也可用于否定句中,如：Mike is AS tall AS I.麦克和我一般高.Mike is not AS tall As I.麦克没有我高.so … as 只能用于否定句中,也就是说,通常是以 not so...as 出现的；如：The Atlantic Ocean is NOT AS big AS the Pacific Ocean.大西洋没有太平洋大.在否定句中既可以用 not as ...as...也可以用 not so...as,而在肯定句中只能用 as...as; 关于as...as的常见句型：(1)as...as possible Please answer my question as soon as possible.请尽快回答我的问题.(2)as...as usual/before She looks as pretty as before.她看起来和以前一样漂亮.(3)as long as...(引导条件状语从句) It took us as long as three years to carry out the plan.我们花了长达三年的时间才完成这项计划.(4)as far as He walked as far as the railway station yesterday evening.昨天傍晚,他一直散步到火车站。

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