Bickerton and others have claimed that in creole languages, the zero-marked verb refers to a present situation with stative verbs and has a past perfective function with dynamic verbs (which corresponds to the first value "Stative verbs with present reference and dynamic verbs with past perfective reference are both unmarked"). This feature examines how verbs referring to permanent states like ‘can’, ‘know’, ‘love’, or ‘want’ are marked for present reference and how dynamic verbs are marked for past perfective aspect (or past reference, if the language has no dedicated perfective aspect marker).