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In linguistics, sentence function refers to a speaker's purpose in uttering a specific sentence, phrase, or clause. Whether a listener is present or not is sometimes irrelevant. It answers the question: "Why has this been said?" The four basic sentence functions in the world's languages include the declarative, interrogative, exclamative, and the imperative. These correspond to a statement, question, exclamation, and command respectively. Typically, a sentence goes from one function to the next through a combination of changes in word order, intonation, the addition of certain auxiliaries or particles, or other times by providing a special verbal form. The four main categories can be further specified as being either communicative or informative.
Communicative vs. informative
These types of sentences are more intended for the speaker's sake than for any potential listener. They are meant more for the speaker's immediate wants and needs. These sentences tend to be less intentional (out of frustration for example), in general more literal, more primitive, and are usually about the here and now. Because of these features, it is generally speculated that this is pretty much the basis or limitation of any form of animal communication. (Speculated because scientists will never truly be able to understand non-human forms of communication like we do our own; although studies with "talking" primates have clued us in to a certain degree.)
An exclamative or exclamatory sentence is released because of, and expresses strong emotion. They many times feel like involuntary reactions to a situation, yet they can technically be stifled if need be. And while exclamatives most usually manifest themselves as one or two word interjections, they can also come as major sentences. They are essentially unfiltered vocalizations of our feelings, and a form of self-talk because they are directed either at the speaker themself or at nobody in particular. In punctuation, an exclamative is ended with an exclamation mark.
- I'll never finish this paper in time!
An imperative sentence gives anything from a command or order, to a request, direction, or instruction. Imperative sentences are more intentional than exclamatory sentences and do require an audience; as their aim is to get the person(s) being addressed either to do or to not do something. And although this function usually deals with the immediate temporal vicinity, its scope can be extended, i.e. you can order somebody to move out as soon as you find yourself a job. The negative imperative can also be called the prohibitive and the inclusive plural imperative, the hortative. It is debatable whether the imperative is only truly possible in the second person. The vocative case of nouns can be said to indicate the imperative as well since it does not seek information, but rather a reaction from the one being addressed. An imperative can end in either a period or an exclamation point depending on delivery.
- Look at me!
- After separating them from the yolks, beat the whites until they are light and fluffy.
Informative sentences are more for the mutual benefit of both the listener and the speaker, and, in fact, require more of an interaction between both parties involved. They are more intentional or premeditated, less essential, more cooperative, and they aim to either provide or retrieve information, making them quintessential abstractions. But perhaps the most differentiating quality that distinguishes informative sentences from the communicative is that the former more naturally and freely make use of displacement. Displacement refers to information lost in time and space which allows us to communicate ideas relating to the past or future (not just the now), and that have taken or can take place at a separate location (from here). To an extent, this is one of the biggest differences between human communication and that of other animals.
The declarative sentence is the most common kind of sentence in language, in most situations, and in a way can be considered the default function of a sentence. What this means essentially is that when a language modifies a sentence in order to form a question or give a command, the base form will always be the declarative. In its most basic sense, a declarative states an idea (either objectively or subjectively on the part of the speaker; and may be either true or false) for the sheer purpose of transferring intel. In writing, a statement will end with a period.
- Roses are red and violets are blue.
- She must be out of her mind.
An interrogative sentence asks a question and hence ends with a question mark. In speech, it almost universally ends in a rising inflection. Its effort is to try to gather information that is presently unknown to the interrogator, or to seek validation for a preconceived notion held. Beyond seeking confirmation or contradiction, sometimes it is approval or permission that is sought as well, among other reasons one could have for posing a question. The one exception in which it isn't information that is needed, is when the question happens to be rhetorical (see allofunctional implicature section below). While an imperative is a call for action, an interrogative is a call for information.
- What do you want?
- Are you feeling well?
Declarative vs. Affirmative vs. Positive
A declarative statement should not be deemed synonymous with an affirmative one. This is because although a declarative statement can state facts (given that the speaker is not consciously lying), it can also express something which is not true. The information he or she is providing, regardless of whether it be true or not in reality, is in fact true or false to that speaker. Therefore, a declarative can be either in the affirmative or in the negative, and we can say that, Joanna is late and Joanna is not late, both technically qualify as declarative sentences. Declarative refers to a sentence's function or purpose, while affirmative and negative deal with a sentence's veracity, or grammatical polarity, which is why the different terms can overlap simultaneously.
Though not as erroneous as the above misnomer, there is a clouding that can occur between the slight distinction of the affirmative, and the positive. Although it semantically speaking comes natural that positive is the opposite of negative, and therefore should be completely synonymous with affirmative, grammatically speaking, once again they tend to be separate entities; depending on specificity. Positive in linguistic terms refers to the degree of the quality of an adjective or adverb (along with the comparative and superlative), while affirmative refers to the perceived validity of the entire sentence.
Thus, all three terms being separate entities, an adjective or adverb can be in the positive degree but expressed in the negative, so that the sentence, This hummer does not seem to be eco-friendly, has all negative, positive, and declarative properties.
In fact, an exclamatory, imperative, as well as a question can be in the negative form: I can't do this!, Don't touch me, Don't you want to?
There are many instances in which a sentence can be grammatically shaped as one function, yet in actual execution, may serve a completely different purpose than suggested by the way it was constructed; hence, allofunctional, to mean 'serving a different purpose than originally intended'. Or in other words, it is very subtly yet unequivocally implied by process of pragmatics that its function must be changed to another in order for the sentence to make sense in the present context of conversation.
A classic example would be the "question": Could you pass the salt?
In the above sentence, although it is grammatically structured as a question, it can quite safely be inferred that the speaker is not inquiring as to whether the person they are addressing is physically capable of passing the salt at the dinnertable or not. What the speaker really wants is to get the salt. It is a request, or call for action as opposed to information, thus making the sentence allofunctional (note that adding a word like 'please' at the end would tend to make this point clearer, and when posed as a question, this request is perceived as being more polite than if it were simply in the natural imperative). Therefore, what at first may come off as an interrogative sentence upon initial delivery, the listener must almost immediately reinterpret as an imperative and respond accordingly.
Other examples include;
- Exclamative interrogative (interrogative structure with exclamative function): Why does this keep happening to me?
- I might utter this phrase only to vent out my frustration vocally.
- Imperative declarative (declarative structure with imperative function): I would feel more comfortable if you wore your seatbelt.
- If I say this to you I'm strongly urging you to buckle up.
The list goes on, and as a matter of fact, all 12 combinations between each of the four functions and their three other counterparts should be theoretically possible.
Another important point to note is that the allofunctionality of a sentence is completely language specific as to how it differentiates function. To exemplify this, we can look at English and generalize that imperative sentences, when affirmative, tend to begin with the verb, while declarative sentences that are prosaic will almost always start with the subject (this is because in the imperative, the subject is implied, or obviously unmistakable, since it is the subject itself which is being spoken to). All that being taken into account, we can more clearly see why a statement such as, You are not going to that bar. (I forbid it), would qualify as allofunctional.