Americans eat- as they actually need every day

这是主谓宾句型中的原级比较句,比主系表句型中的原级比较要难一些.但还是有记忆方法的.请看由浅入深的句子演示：
I have many books.
I have as many books as Peter does.
I have twice as many books as Peter does.
I have three times as many books as Peter does.
I eat much food.
I eat as much food as Peter does.
I eat twice as much food as Peter does.
I eat three times as much food as Peter does.
如果一样多,比较简单.
二倍以上,结构：主语+谓语（Vt.)+倍数词+as +much/many +名词（作宾语）+ as+比较对象（省略句）