This paper will explain the asymmetry parallelism between node ‘because’ and toki ‘when’ in terms of the availability of Evidential Phrase in syntax, following the analysis by Chinque [1], Speas [2] and Tenny [3]. This (in)compatibility of Evidential Phrases with Adjunct Clauses is further motivated by the syntax-semantics difference of Adjunct Clauses discussed by Johnston [4].