英语句子成分划分疑问
Four score and seven years ago our fathers brought forth on this continent,a new nation,concieved in liberty,and dedicated to the proposition that all men are created equal.
Now we are engaged in a great civl war,testing whether that nation or any nation so conceived and so dedicated,can long endure.
请问这两句的句子成分怎么划分?主谓宾定状补各是哪部分?还有就是能讲解下英语中逗号的用法和逗号在长句的分析中有什么技巧吗?