as.. as比较句
1 As… as句型中的第一个as是副词，后面可以加形容词，或者副词，而后面的as是连词，要加句子，但是经常会省略。
He is as strong as his father. (√)
解析：strong是个形容词，从句应该是his father is strong，但是is strong和主句的对应部分重复，所以可以省略。
He can run as fast as his father does. (√)
解析：fast 是个副词，从句应该是his father runs fast，但是run fast和主句的对应部分一致，所以可以省略，只剩下一个助动词does.
2 As… as句型中从句可以省略的部分往往是主句中重复的部分，对比的可能是主语，状语等
His writing is not as good as yours. (√)
解析：从句事实上是your writing is good. 但是writing is good都重复了，直接去掉，用yours来替换。
You can spend as much money on books as you can on your car.
解析：从句事实上是you can spend money on your car. 但是省略了spend money.
The labour force is not as cheap in this country as in China. (√)
解析：从句事实上是 the labour force is cheap in China, 但是省略了前面，只剩下一个地点状语in China
3 如果系动词不一致，系动词不可以省略
You are as young as you feel. (√)
解析：从句是you feel young. 只能省略young，不能省略feel。
4 有时候as … as后面会出现you think, you thought, you expected
The service is not as good as you think. (√)
解析：从句其实是you think the service is good，但是后面都省略了。
The service is not as good as you expected it to be. (√)
解析：从句其实是you expected the service to be good， 也是省略了对应的部分。
5 as … as 前面可以加twice, three times, four times这些表达表示倍数
Black male graduates are nearly twice as likely to be unemployed as their white counterparts. (√)
解析：从句其实是white male graduates are likely to be unemployed. 但是和主句重复的部分全部都去掉了，只剩下white male graduates, 最后还用counterparts 替换male graduates
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