 There is considerable variation in the forms; only one possibility is shown here.Third person singular masculine is given in each case, and in addition the first person singular (in the perfect) or third person masculine plural (in the imperfect) for cases where the stem changes within the paradigm.The very common verbs {"nbr"} 'live, be' and {"gbr"} 'do' undergo simplifications in the gerundive, where the "b" is deleted