Respuesta:
1) The dishes was washes by Karla
2) The Everest Mountain was climbed by Ferd and Joe
3) The New car is crashed by my wife
4) The window was opened by the teacher
5) The dinner was cooked by Mary
6) ?! Esa no me sale
"Nose si están todas bien, pero calculo que si por el ejemplo que pusiste de como pasar horciones activas a pasivas"