zlozone przymiotniki

jak to w koncu jest

gdy mowimy dwu-godzinna lub szescio tomowa mowimy:

two-hour, six-volumne - czyli rzeczownik pozostaje bez zmian

ale dlugonoga juz jest long-legged.

skad te "ed" i kiedy go dodajemy a kiedy nie?

When you want to make an adjective derived from a noun that is related to a part of the body you add '-ed' or'-d' to that noun; e.g.
a girl with brown eyes - a brown-eyed girl (you always get the adjective without the plural 's' in the noun)
a boy with a short neck - a short-necked boy