English determiners constitute a relatively small class of words. They include the articles "the" and "a"; certain demonstrative and interrogative words such as "this", "that", and "which"; possessives such as "my" and "whose" (the role of determiner can also be played by noun possessive forms such as "John's" and "the girl's"); various quantifying words like "all", "some", "many", "various"; and numerals ("one", "two", etc.). There are also many phrases (such as "a couple of") that can play the role of determiners.