The verb system is a simplified version of the systems found in English and the Romance languages. There is no imperfective aspect, as in Romance, no perfect as in English, and no continuous aspect, as in English and some Romance languages. Except (optionally) for "esser" 'to be', there are no personal inflections, and the indicative also covers the subjunctive and imperative moods. Three common verbs ("esse", "habe" and "vade") usually take short forms in the present tense ("es", "ha" and "va" respectively), and a few optional irregular verbs are available.