 First, he argues that every proposition belongs to the subject-predicate form ‘\(A\) has \(b\)’ (TS, § 127; recall that this does not prevent them from also belonging to other forms.) He acknowledges that he has no conclusive argument for his thesis, but claims that he has been able to find acceptable subject-predicate paraphrases of all the sentence forms that have occurred to him (Bolzano 1843: 48).