 Secondly, infinitival interrogatives such as “how to Φ” and “what to Φ” are ambiguous between a deontic reading (how to Φ = how one should Φ; what to Φ = what one should do) and an ability reading (how to Φ = how one could Φ; what to Φ = what one could do). The deontic reading does not seem relevant when we ascribe knowledge-how. Hence the relevant reading must be an ability reading. Joining these two disambiguations, the truth conditions of knowledge-how ascriptions are (cf. Schroeder 2012):