Question

英文翻译，分析句子成分以及出现的语法现象

As each case was decided by an appellate court,an opinion was writtrn giving the reasons why the case was decided.

Answer 1

每个案件被法庭受理前，都必须附上受理这份案件的原因。

少了个逗号，原句应该是这样的：
As each case was decided by an appellate court,an opinion was writtrn,giving the reasons why the case was decided.

前面应该很好理解，就不解释了。
giving the reasons why the case was decided 这句话是用来修饰opinion的，表示这个opinon的目的（是为了提供案件受理的原因）。
有疑问可以追问。