Lithuanian has a past frequentative (or iterative), which serves to express a single action repeated in the past. Starting from the infinitive without –"ti", it is formed by adding the invariant morpheme –"dav"– followed by the regular past tense suffix of the first conjugation. For instance, "dirb·ti" ("to work", a first-conjugation verb), whose plain past tense is "dirb·au" ("I worked" or "I have worked"), has a past iterative of "dirb·dav·au" ("I used to work"). The six intersections of person and number map onto five distinct frequentative endings; there is no morphological distinction of number in the third person, nor of conjugation class in general.