Составьте 4 вопроса разного типа к предложению: "не could find new materials about polynesian life and customs."

Could he find new materials about Polynesian life and customs?
Could he find new materials about Polynesian or Russian life and customs?
He could find new materials about Polynesian life and customs, couldn't he?
Who could find new materials about Polynesian life and customs?
What could he find about Polynesian life and customs? What materials could he find?