They also function as arguments in such constructs as participial phrases and prepositional phrases. Some nonfinite clauses, including infinitive and participial clauses, may also function as relative clauses. Adverbs appear as suffixes on non-final and participial verb forms. Prenominal modifiers consist of pronouns, certain adjectives, participial and relative clause modifiers, and other nouns. It functions as an adjective or as the verb in a participial phrase. It is usually in either base or [in Verb + Verb compounds] "conjunctive participial" form. Other sets are the past, optative, participial and hearsay forms. An important subgroup of Class II adjectives is the present participial forms in "-ant". Specifically, "comprised" within "comprised of" is a "participial adjective". Verbs also have a number of participial forms, which Turkish makes much use of. One way of making them is to use a participial verb, as described above. The four dependent moods are causative, conditional, contemporative, and participial. If they differ, the participial mood or causative mood are used. For the participial form of the persistive tense, see below. Perfect tense is constructed with "at have" ("to have") and participial forms, like in English.