When style of painting is Marcel Duchamp famous for?
He is most famous for being a Cubist painter but also had many famous works associated with the Dada movement.
When do you use a verb in the infinitive?
The most common usage of a verb in the infinitive is when it comes directly after a verb that has already been conjugated.
Portuguese is the official language of how many countries?
Portuguese is the official language of at least 10 countries but this number depends on what you consider "official". Portuguese is spoken in many places where it is not the official language.