205. The active participles, preceded by the auxiliary verb esti = to be, in its various moods and tenses, form the compound tenses of the active voice.

206. The passive participles, with the verb esti, form all the moods and tenses in the passive voice.

207. Participles, like adjectives, agree in number and case with the nouns or pronouns to which they refer.

Examples. Ni estas vidintaj la viron = We have seen the man. Ŝi vidis la virojn legantajn = She saw the men who were reading (the reading men). Ni vidas la krimojn elfaratajn ĉiutage sur la stratoj = We see the crimes being perpetrated daily in the streets.

208. All the participles can be used as adjectives and also as nouns and adverbs, by substituting -O for -A for a noun, and -E for -A for an adverb. The words still retain the signification of the tense of the participle. Participial adjectives and adverbs in the active voice govern the accusative.

209. Examples in the active voice.

(a). Participial nouns, as:—La leganto = The reader (person now reading). La leginto = The reader (person who has been reading). La legonto = The reader (person about to read).

Examples.—La leganto havas bonan voĉon, sed la leginto havis pli bonan; mi kredas, tamen, ke la legonto havos la plej bonan voĉon el ĉiuj = The (present) reader has a good voice, but the (previous) reader had a better; I believe, however, that the (coming) reader will have the best voice of all. Ĉi tiu (or, tiu ĉi) ideo okupis la grandan pensanton ĝis la fino de lia vivo = This idea occupied the great thinker up to the end of his life.

(b). Participial adjectives agree with their nouns in number and case, but when predicative they agree in number only (see remarks on adjectives, pars. [36], [108], [110], also par. [87] (d)).