1.3.3 Grammatical aspects of meaning
Consider the following bracketed sentence:
(47) | I think [that Mary may marry Martin] |
The predicate here is the verb marry and the arguments are Mary and Martin. Let us call the part of meaning expressed by a predicate and its arguments the basic proposition. But what role do the other words, may and that, have in the sentence? Clearly, they have no role in the basic proposition, being neither predicates nor arguments. But they do carry some meaning. May is a modal auxiliary verb and in this sentence it either expresses that the event described by the predicate and its arguments (Mary marrying Martin) is a possibility or that permission has been given for it to take place:
(48) | a | Mary may marry Martin – but it’s not sure that she will. |
b | Mary may marry Martin – his mum will allow it. |
The kind of meaning we are talking of here is known as the modality of the sentence and thus auxiliary verbs like may, can, should, etc. express modality.
That is a complementiser and its meaning is a little more difficult to determine. We can see its meaning if we compare (47) to (49):
(49) | I asked [if Mary may marry Martin] |
In the bracketed sentence here, the complementiser is if and we can see that the difference between this and the previous case is that here the sentence is interpreted as a question, not a statement as previously. The sentence beginning with that is declarative and the one beginning with if is interrogative. Given that the only difference between the two is the complementiser, it seems reasonable to assume that this is what the complementiser contributes to the meaning of the sentence. The distinction between declarative and interrogative is known as the force of the sentence and hence complementisers contribute to this aspect of sentence meaning.
Functional categories, such as modal auxiliaries and complementisers are specified for the [+F] value and a distinguishing property of these categories is that they are not involved with the assignment of Θ-roles. They therefore lack Θ-grids in their lexical entries.
Having established this major division we will now proceed to investigate the individual categories.