Yahoo網頁看到Whatever is has every reason for being. 存在的東西總有其存在的理由。這句Whatever is看成主詞用？

Referring to the book recommended by kuangkwo,by TW Chen's the heart of grammar,you must study the book containing the rules of grammar of a language.If you don't like others to help, but stick with the fixed answer, then remain your fixed answer !
Existence is the state of existing.
hence, be, have been,be real vi are coming into existence,n.
Whatever it is-----noun cl as S
can have------v+BE
every reason for being------subject complement
Thanks for the compliment, an expression of praise, admiration, respect.