 The four Aristotelian questions—if, that, what, and why—discussed in Posterior Analytics B1–2 are subject to a more systematic analysis in Avicenna’s Burhān I.5 and IV.1. In Burhān I.5, in particular, they are rearranged in three pairs with several internal subdivisions: (i) what (mā), with respect to the meaning of the name or with respect to the essence; (ii) why (limā), with respect to unqualified existence or with respect to existence in a given state; and (iii) if (hal)/that (anna), again with respect to unqualified existence or with respect to existence in a given state. The notion of existence in a state in (ii) and (iii) encapsulates the case of attribute ascription in its causal and factual version, respectively. The three pairs of questions may apply to both subject and predicate of a scientific statement.