The Neo-Mandaic verb may appear in two aspects (perfective and imperfective), three moods (indicative, subjunctive, and imperative), and three voices (active, middle, and passive). As in other Semitic languages, the majority of verbs are built upon a triconsonantal root, each of which may yield one or more of six verbal stems: the G-stem or basic stem, the D-stem or transitivizing-denominative verbal stem, the C-stem or causative verbal stem, and the tG-, tD-, and tC-stems, to which a derivational morpheme, t-, was prefixed before the first root consonant. This morpheme has disappeared from all roots save for those possessing a sibilant as their initial radical, such as "eṣṭəwɔ" ~ "eṣṭəwi" ("meṣṭəwi") ‘to be baptized’ in the G-stem or "eštallam" ~ "eštallam" ("meštallam") in the C-stem, in which the stop and the sibilant are metathesized. A seventh stem, the Q-stem, is reserved exclusively for those verbs possessing four root consonants.