relevant to 是形容词短语,意思是 “对于 ... 相关的”,可以用作表特征的表语或后置定语。
relevance to ... 是名词短语,意思是 “与 ... 的相关性”,只能用作主语、宾语或表属性的表语
relevant to 与。。有关的, 为形容词短语。作表语,定语
These books is relevant to your studying, pls buy them.
relevance to 与。。有关的,为名词性短语。作主语或宾语
Do you know the relevance beteen them?
前者是形容词,前面要用be动词