…,which(be) located in句中怎么判断何时用be？

1、Nan Jing, which located in the west of the Changjiang River. 没有be动词 2、Our company, which is located in Chengjiang industrial Zone.有be动词 为什么一个有be，一个没有？能说明一下吗？我如果要用这个located这个句型，怎么判断，什么时候该加上be，什么时候不用？

就我看，你给的例句都是错的，be located in 意为“坐落于”，只有当其作主句的谓语成分时，才必须用be动词。不然，就是作定语，这是可将定语的主谓（即引导词和be动词）一起省略，也可保留。

Nanjing located in.......is well known for us.

Our company is located in Chengjiang industrial Zone

严格来讲这两个句子是错的，都不完整。

完整的句子可以这样说Nan Jing, located in the west of the Changjiang River，has a long history.

Our company, which is located in Chengjiang industrial Zone, is very large.

第一个句子located in the west of the Changjiang River属于省略，省略了which和is或者也可以直接理解为过去分词短语做后置定语。

第二个句子which is located in Chengjiang industrial Zone则是完整的定语从句。