英语语法： as....as....的具体用法是如何 as是作为介词理解还是什么？两个as中间可以放什么内容？整个

as……as
用于比较两个事物，中间可以放形容词，形容词性词组，副词，表达“……和……一样……”的意思

He is as tall as me 他和我一样高
He runs as fast as me.他跑地跟我一样快

你列举的screwed up 算是一个过去分词构成的形容词性词组，意为：心烦意乱的
例：I was totally screwed up with him 我被他弄的心烦意乱

as作为介词有以下意思
as a stutent “作为”一个学生
he works as a doctor there 他“以”医生的身份在那工作——他在那当医生
We treat him as our brother.我们把他”当做兄弟看待“

同时as也可以做连词，用作引导时间、原因状语（从句），具体意思根据不同句子而不同

I'll behave toward them as I would like to be treated.我希望别人怎样对待我，我就会怎样对待他们。

Today, as usual, he was wearing a three-piece suit.今天他像往常一样穿着一套三件套西装。

As you can see, we're still working.如你看到的，我们仍在工作。

Enjoy the first hour of the day. This is important as it
sets the mood for the rest of the day.享受一天中的第一个小时。这很重要，因为这第一个小时决定当天其余时间的情绪。