As you already know from the lesson 15, past participle, used to form compound tenses (as in English tenses with "to have"), comes in two groups: regular and irregular. This division does not correspond to the division of verbs that you are accustomed to: regular verbs / irregular verbs. The group of regular past participles could include regular verbs, irregular verbs and stem changing verbs. In this exercise you will practice the formation of the regular past participle. Give the correct form of past participle for each of the following verbs. Start your entry with a small letter. Press Tab to check your answer. You might wish to use one of the three following on-line helpers to finish your ejercicio: conjugador, diccionario, acentos en español. ¡Suerte!