By using presuppositions, we are able to make a statement and have basic assumptions contained in that statement accepted, unconsciously, as being true.
Selection Restriction − If my professor gets pregnant, I’ll be very happy. (Restricted to being a professor with the subgroup female) (Presupposes my professor is a woman.)
Questions − By asking a question we presuppose what is asked in a question. Have you taken my NLP book? (Presupposes someone has taken my book.)
Negative Questions − Isn’t Leading Edge Communications not the top management consultant company in Calgary? (Presupposes that Leading Edge Communications is a top management company.)
Rhetorical Questions − Asking a question which does not require an answer. Who care about that. (Presupposes no one cares about that subject.)
Spurious Not − I wonder if you are not already more confident than most? (Presupposes you are already confident.)
Proper Names − Using proper names which presuppose the existence of that person.
Pronouns − Using pronouns which presuppose the existence of a male, female or inanimate object.
Definite Descriptions − I liked the man with the red Honda. (Presupposes that a man and a red Honda both exist).
Change of Place Verbs − (COME, GO, LEAVE, ARRIVE, DEPART, ENTER) (Presupposes something moved)
Many of these presupposing statements can be noticed naturally occurring in your day to day language, how will you use them with purpose? and to what end?
Source: http://www.andrewduffy.co.uk/tip-75-nlp-skills-polishing-language-presuppositions-part-5/
