几个英语小问题，请进

1.通常情况下as...as 中间的单词应是形容词还是副词？比如i am as careful/carefully as you.

用形容词还是副词取决于as...as要修饰限制的成分。这里做am的表语，是主系表的结构，用形容词。

Do it as soon as you can

尽你最快速度把它做完。as soon as you can修饰限制Do ，中间用soon副词。

2.so as 和such as 怎么区分

so+形容词 so beautiful a girl

such+名词 such a beautiful gril

3.i have gone to Beijing和i have been to Beijing怎么翻译，有啥区别？

I have gong to Beijing 我去过北京。言外之意，现在不在北京。

I have been to Beijing 我现在已经在北京了。

麻烦大家了，我英语很差，希望能有人解答。

第二问搞错了，应该是：so a 和such a 怎么区分

你最好把句子放上来，so a 不怎么常见。