On the 助動詞 wikipedia page there is this sentence and I can't make sense of the part in bold:
Here is my try :
(Those 連体形 are) only used when preceding things like 「の」「のに」「ので」. However, a noun cannot use those 連体形 in order to modify (another element). Moreover, from the view point which does not recognize na-adjectives and (???) parts of speech, there is another way of thinking ???.
May somebody help me so as to understand this part?