Yo he visto a mucha gente buena tirar su vida por la ventana a causa del alcohol.I've seen a lot of good people to throw their lives out of the window because of alcohol.
No sé nada sobre los osos polares. - Yo he visto un documental donde decían que recorren grandes distancias.I don't know anything about polar bears. - I watched a documentary where they said they walk long distances.
He ido al cine dos veces esta semana. - Pues yo he visto varias películas en la tele.I've gone to the cinema twice this week. - Well, I've watched several films on TV.