Final answer:
The term that says when a sentence is negated, the presuppositions must be the same is presupposition.
Step-by-step explanation:
The correct term that says when a sentence is negated, whatever the presuppositions are, they have to be the same is presupposition.
Presuppositions are the underlying assumptions or beliefs that are part of the meaning of a sentence. When a sentence is negated, the presuppositions remain the same.
For example, if the sentence is 'John stopped smoking', the presupposition is that John used to smoke. If we negate the sentence, 'John did not stop smoking', the presupposition remains that John used to smoke.