Basic English Syntax with Exercises

binary features

1.3.1 Categorial features

One way to impose a system on elements is to use a set of features to distinguish between them. Each category can then be defined in terms of a unique collection of these features, but they may share some of the features with other categories, accounting for similarities between them. In linguistics, binary features, i.e. those which can be valued in one of two ways (plus or minus), have been found useful for producing systems of categorisation. For example, we might propose a feature [±F] (‘F’ to indicate functional) to distinguish between the thematic and functional categories. All thematic categories would possess the [–F] feature and all functional categories would possess the [+F] feature. In this way we can immediately distinguish between the two groups and account for why certain categories are similar to others in terms of which feature they possess.

1.3.1 Categorial features

Having demonstrated that we can capture similarities and differences between word categories using binary features, let us turn to the issue of what categories there are. We will start this discussion by considering the two binary features [±N] and [±V]. So far we have shown how combinations of these features can be used to define nouns, verbs and adjectives. The two binary features can be combined in four possible ways, however, and hence there is one possible combination that we have yet to associate with a category. This is demonstrated by the following tab

1.3.1 Categorial features

We see from the discussion above the predictive power of the system that we have set up: the system predicted that there should be a fourth thematic category that has certain properties and these fit the category of prepositions very well. We can take this as evidence in favour of this system of features. What else does the system predict? It is clearly predicted that if we add a third binary feature to the two we have just been discussing, then a further four categories will be defined. This again matches perfectly with the description of categories we started this section with, as seen in (23). With the third feature, [±F], there should be four functional categories which match the four thematic categories in terms of their feature settings for [±N] and [±V]. We have already seen how determiners and modals can be analysed as functional nouns and functional verbs, respectively. The expectation is that degree adverbs, such as so and too, and complementisers, such as that and if, should be related to adjectives and prepositions in the same way. As degree adverbs modify adjectives in a very similar way to how determiners modify nouns, it is not difficult to conclude that degree adverbs are functional adjectives. This leaves complementisers to fill the final place as functional prepositions. There is evidence in favour of this assumption, but it rests on notions not yet introduced, so we will have to wait until later to demonstrate it.

1.3.1 Categorial features

A further advantage of this system is that it places restrictions on what categories we can suppose to exist, hence increasing its explanatory power. For example, we would not be entitled to come up with an extra category without destroying the system developed. One way to add extra possible categories within the system would be to declare another binary feature. But this would not allow the addition of one extra category, but a further eight! Moreover, these extra categories would have to be shown to be related and opposed to the existing categories in the same way that these are related and opposed to each other.