Verbs, like those of other western Indonesian languages, are not conjugated for tense, mood or aspect. All affixes are derivational. Verbs may appear in two forms: unmarked (also known as basic or oral) and nasal. The basic form appears in vocabulary lists and dictionaries, and the nasal form adds the nasal prefix "n-". The nasal prefix, which also appears as "nge-", "m-" and other forms, may delete the first consonant of the basic form. For example, the unmarked form of "to buy" is "beli" and the nasal form is "mbeli". The nasal prefix can also turn a noun into the corresponding verb; for example, "kupi" ("coffee") becomes "ngupi" ("to drink coffee"). The function of the prefix and nasal derivations from the basic form differ by dialect. For example, eastern dialects of Sasak have three types of nasalization: the first marks transitive verbs, the second is used for predicate focus, and the third is for a durative action with a non-specific patient. Imperative and hortative sentences use the basic form.