as...as的用法,请详释,谢谢

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as+adv/adj+as

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as...as 用于副词和形容词之前,as+adv./adj.+as 以构成比较形式,具体如下1. 第二个as用做介词,有:达到与...相同的程度;与...等同的意思例: He is as tall as his father.I haven't know him as long as you. 我没有你认识他的时间长.2. 第二个as做连词用,表示:同...一样到达某种程度;与...相同/等同的意思e.g. Run as fast as you can. He looks as ill as he shounded on the phone.他的样子和他在电话里说话的声音反映出来的病情是一样的.