 The hallmark of presuppositions, as well as the most thoroughly studied presuppositional phenomenon, is projection (Langendoen and Savin, 1971). Consider (2). This has all the presuppositions in (3). These presuppositions all follow from utterances of the base sentence in (2), as do the regular entailments in (4): someone who sincerely uttered (2) would certainly be expected to accept the truth of (3) and (4), as well: