there is one language used in every country in the world为什么不加is

题目

there is one language used in every country in the world为什么不加is
如题,是因为there is 中的is已经有了吗,麻烦详尽一点最好再举个例子,

答案

是的,因为there be 句型中是属于倒装,真正的主语是one language
如果不用倒装,正常语序就是,
one language is used in every country
因此,按照主谓一致的原则,谓语动词看主语,主语是单数,谓语也用单数