 The demonstrative conventions, by contrast, associate particular statings—themselves historic events—with some amongst the accessible historic situations, things, events, etc. Consider, for example, the following simplified case. There are two accessible situations, one of which is of the cat-on-mat type and one of which is of the dog-on-linoleum type. The descriptive conventions governing the English sentence “The cat is on the mat” do not, and cannot, determine which of the two accessible situations a speaker aims to talk about on a particular occasion. In order to achieve that, the speaker must find a way of making manifest that their goal is to select, say, the dog-on-linoleum situation. They might achieve this by, for example, their use on a particular occasion of the present tense, or by pointing, etc. (1950a:  121–126).[10]