Finite verbs have a basic finite stem that is either an unanalysable lexical root (e.g. "-bil-" 'go about, move (intr.)') or such a root preceded by the causative/intensive prefix "-ra-" (e.g. "-rabil-" 'cause to move, use'). From regular basic stems two tense stems are derived as follows: the present stem with prefix "-a-" and the non-present stem with prefix "-e-", e.g. "-abil-" and "-ebil-" are the regular present and non-present stems of "-bil-", and are the corresponding tense stems of "-rabil-", and so on. The present stem is used in the present tense, the present potential tense and the non-third-person imperative, e.g. present "d-abil" 'he/she/it goes about', present potential "d-abil-ke" 'he/she/it may go about', second-person imperative "h-abil!" 'go about!'. The non-present stem is used in the past and hypothetic tenses (non-potential and potential), and in third-person imperative forms, e.g. "z-ebil-en" 'he/she/it went about', "ba-l-ebil" 'if he/she/it went about', "z-ebil-ke-en" 'he/she/it might or would have gone about', "l-ebil-ke" 'he/she/it might or would go about', "b-ebil!" 'let him/her/it go about!' (not in common use).