  A range of logics have been developed for determining the truth-values of complex sentences in the presence of truth-value gaps. One option is to use Weak Kleene logic (WK), on which a complex sentence which has a truth-valueless constituent will always be truth-valueless as well. But assuming the truthvaluelessness view takes a sentence to be infelicitous if and only if it is truth-valueless (at least where the lack of truth-value is due to the occurrence of some category mistake), this approach will over-predict infelicity. Consider for example the following: