What of negation? In the previous chapter I argued that the semantic representation of negation had to represent the claim that the conditions for the truth of the corresponding positive sentence were not met, and that this representation had to be in the form of a disjunction of the negation of each of the conditions for the truth of the corresponding positive sentence. So for example I suggested that the interpretation of the sentence It wasn't a woman had to characterize the implication that either the item described was not female or not adult or not human, this being a disjunction of the truth conditions of its positive congener. I pointed out at the end of that chapter that such a characterization of negation conflicted with the truth-conditional definition of ambiguity that a sentence is ambiguous if it is true under different sets of condi¬tions. But we have just seen in this chapter that that characterization is in any case insufficient in that it predicts that all cases of only generally specified interpretations are ambiguous. What prediction does the verb phrase pro-form test make about negation? We have seen that negative sentences, at least in general, have a single representation of meaning, given by a disjunction. This being so, we should predict that negative sentences are unambiguous; and this the pro-form test confirms.