 The notion of ontological dependence helps to articulate how states of affairs are related to particulars and properties. But the ontological dependence of states of affairs on properties and particulars is not brute. It is because some properties are predicated of some objects that (i) they form a state of affairs (ii) such that this state of affairs depends on them and can be said to involve them. A fundamental question about states of affairs concerns then the conditions of predicability. We will come back to this question in section 6.3.