How do Americans pronouce pretty?

Answer 1

Americans do not all pronounce it the same way. In general, an Englishmanmight hear the American sound of the "t" sounding more like "d." If you can find a recording of Roy Orbison singing "Pretty Woman," that will give you one variety of American pronunciation.

Answer 2

Most Americans pronounce "pretty" as "prit-ee." The "t" sound in the middle is not emphasized, so it may be pronounced more like "pri-ee" or "pre-ee" in some American accents.