Types of Presupposition
Presuppositions are the background assumptions that a sentence takes for granted. When someone says "The King of France is bald," they're not arguing that there is a King of France; they're assuming it as already established. Understanding how presuppositions work, and what triggers them, helps you unpack the hidden assumptions baked into everyday language.
This section covers the two main types of presupposition (semantic vs. pragmatic), the specific linguistic structures that trigger them, and how to analyze presuppositions in real utterances.
Semantic vs. Pragmatic Presuppositions
Semantic presuppositions arise from the conventional meaning of words and grammatical structures. Their defining feature is that they survive under negation and questioning. Consider:
- "The King of France is bald" presupposes that a King of France exists.
- "The King of France is not bald" still presupposes that a King of France exists.
Whether you assert the sentence, negate it, or turn it into a question, the presupposition holds. That stability is what makes it semantic.
Pragmatic presuppositions depend on conversational context and speaker intentions. They can be canceled or suspended if the context shifts. For example:
- "I'm sorry I'm late" presupposes that the speaker is late.
- But if the speaker follows up with "Just kidding, I'm actually on time," the presupposition is canceled.
The key distinction: semantic presuppositions are tied to linguistic form and resist cancellation, while pragmatic presuppositions are tied to context and can be withdrawn.
Types of Presupposition Triggers
A presupposition trigger is a word or construction that introduces a presupposition. Here are the major categories:
- Definite descriptions presuppose the existence and uniqueness of their referent. Words like the, both, all, and possessives (my, John's) all function this way. "The cat on the roof is loud" presupposes there is exactly one cat on the roof.
- Factive verbs presuppose the truth of their complement clause. Verbs like know, realize, regret, and be aware all do this. "John regrets that he lied" presupposes that John actually lied. Notice that "John doesn't regret that he lied" still presupposes he lied.
- Change-of-state verbs presuppose a prior state that has changed. Verbs like stop, start, begin, and finish carry this trigger. "John stopped smoking" presupposes that John used to smoke.
- Iterative adverbs presuppose that an event has happened before. Words like again and anymore are the classic examples. "Mary called again" presupposes that Mary had called at least once before.
- Cleft sentences presuppose the truth of the non-focused part of the sentence. "It was John who broke the vase" presupposes that someone broke the vase; the sentence only focuses on who did it.
Analyzing Presuppositions
When you encounter a sentence and need to identify its presuppositions, follow these steps:
- Locate the triggers. Scan the sentence for definite descriptions, factive verbs, change-of-state verbs, iterative adverbs, and cleft constructions.
- State the presupposition for each trigger. What background assumption does each trigger introduce?
- Classify each presupposition as semantic (tied to linguistic form, survives negation) or pragmatic (context-dependent, cancelable).
Here's a worked example with the sentence "Mary's dog is cute":
- The possessive Mary's presupposes that Mary exists and that she has a dog. These are semantic presuppositions triggered by the definite/possessive description.
- Depending on context, the utterance may also carry a pragmatic presupposition that the speaker has seen or interacted with Mary's dog. This one is context-dependent and could be canceled (e.g., the speaker might be reacting to a photo someone else showed them).
Role of Presuppositions in Communication
Presuppositions do real work in conversation. They establish common ground, the shared background knowledge that speakers treat as given. By presupposing information rather than asserting it, a speaker can efficiently introduce referents, build on prior discourse, and keep the conversation moving without re-establishing every fact.
Presuppositions can also convey indirect meanings. "I'm sorry I forgot to call you" presupposes that the speaker was supposed to call, while simultaneously conveying an apology. The presupposed obligation is never directly stated, yet both parties understand it.
They can also be used strategically to smuggle in assumptions. The classic example is the loaded question: "Have you stopped beating your wife?" This presupposes that the listener has been beating their wife. Any direct yes-or-no answer accepts that presupposition. Recognizing this kind of manipulation is one of the practical payoffs of studying presupposition triggers.