as...as的用法：as...as意为"和……一样"，表示同级的比较 第一个as为副词，第二个as为连词 其基本结构为：as adj./ adv. as 、not as adj./ adv. as 既可用于肯定句中, 又可用于否定句中，下面我们就来说一说关于as的五种用法及例句详细?我们一起去了解并探讨一下这个问题吧!
as的五种用法及例句详细
as...as的用法：
as...as意为"和……一样"，表示同级的比较。 第一个as为副词，第二个as为连词。 其基本结构为：as adj./ adv. as 、not as adj./ adv. as 既可用于肯定句中, 又可用于否定句中。
若有修饰成分，如twice, three times, half, a quarter, almost, just, nearly, quite等，则须置于第一个as之前。
① Petrol now is twice as expensive as it was a few years ago. 现在汽油的价格是几年前的几倍
② She was nearly as tall as he was.
她几乎和他一样高了。
as...as同级比较的形式有：
① as adj/adv. as...
② as adj 可数名词复数或不可数名词 as
③ as adj a/an 可数名词单数 as
④ as much 不可数名词 as
⑤ as many 可数名词复数 as
⑥倍数、百分数、分数等可以修饰同级比较的句子
so…as的用法：so...as 只用于否定句，即通常是以not so...as 的形式出现。
English is not so(as) difficult a subject as French.
英语不是像法语一样难的科目。
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