I had tried out a model like it before,but as i was not yet used so we went together to fetch it
问题描述：
I had tried out a model like it before,but as i was not yet used so we went together to fetch it
的主谓宾
答
I had tried out a model（ like it） before,（but as i was not yet used ）so we（ went together to） fetch it
括号中的成分起修饰或更进一步说明的作用,这样分析后,就可以清晰的知道句子成分了,主语是we,谓语是fetch,宾语是最后的it（代指前面的a model）