 Even though the semantic values of all the nodes of tree structures associated with (5) and (6) are the same, their ILFs differ given the different linguistic items ‘Superman’ and ‘Clark Kent’. The account thus views the contents of propositional attitudes as hybrids of linguistic and non-linguistic items; i.e., the expressions of the complement clauses and those expressions’s semantic values. And it promises to account for the intuitive truth of (1)-(4) by distinguishing the proposition that Superman is strong from the proposition that Clark Kent is strong in virtue of the difference in linguistic items.