原句：The external syntax of a construction refers to the properties of the construction as a whole, that is to say, anything speakers know about the construction is relevant to the larger syntactic contexts in which it is welcome.
问题：“ anything speakers know about the construction that is relevant to the larger syntactic contexts in which it is welcome“这句话的结构怎么分析，好多从句，这句子是主谓宾都有吗，还是只是一个名词性的成分？我感觉应该就是一个名词性成分，然后“ which it is welcome”怎么翻译？
谢谢，一直不太了解同位语从句，现在知道啦！
还有一个问题contexts in which it is welcome”怎么翻译？它所在的受欢迎的环境？解释不通呀，很奇怪这里为什么出来welcome？