Many participles also wear other sombreros by becoming adjectives or nouns IN ADDITION to being the action verb that follows the conjugation of "helping verb have"--HABER. Several examples are: comida - meal, vista - view, hecho - fact, un dicho - a saying, muerto - dead ...
students of foreign verb conjugation will regard with awe, ebbinghaus trained this way for more than a year. then, to show that the results he was getting weren't an accident, he repeated the entire set of experiments three years later. finally, in 1885, he published a monograph called ...