being求教

FailAgain

原句是：parapsychologist Joseph Banks Rhine claimed statistical proof of subjects able to identify with thought transference a card in the dealer’s hand
我想问的是，抛开proof of的逻辑表达错误问题之外。OG的选项解释还说了这么一句
“While proof might reasonably be followed by of ,
the phrase that follows the preposition is
ungrammatical, requiring a participle to
modify subjects , such as ‘being able to’. . . .”
请问这里直接接able to为什么不行呢？加上being为什么就对了呢？

Siamcoming

of 是介词，后面只能跟名词（动名词etc),而able是一个adj，所以不行