Esprit Rock

In most cases

In most cases, people use presuppositions without knowing it. They do this on daily basis, unaware that they are doing it. For one to know and understand PRESUPPOSITION, first they have to know the definition of what PRESUPPOSITION is, the different types of presupposition, what they do and how one can identify them. One should be able to differentiate the types of presupposition hat are there and know how they work.
Presuppositions also constitute information for the hearer, but this information is conveyed in a way different from either assertion or standard cases of implicature. It is conveyed by virtue of the constraint imposed on the speaker