The infinitive, participle, and gerundive are not verbal moods. Often a participle replaces an adverbial clause. The perfect tense passive is formed periphrastically using a perfect participle and the verb . Spanish has three impersonal forms&colon; the infinitive, the gerund, and the past participle. The gerund is distinct from the present participle. Note&colon; Only imperfective verbs can have an active present participle. The gerund is formed similarly to the present active participle. The dependent action is expressed with an adverbial participle. The first periphrastic conjugation uses the future participle. There are three verbs that have both a regular and an irregular past participle. For uses of the present participle and gerund, see below. This is called the attributive participle. The definite form of the participle is identical to the plural form. A type of iterative aspect can be expressed by reduplicating the imperfective participle. More regularly, the gerundive came to be used as a future passive participle.