"Are they eating her fruit?"
Translation:Spiser de hendes frugt?
"Two fruit" does not work in English. In that case, it has to be "two fruits," the plural form. "Fruit" can be singular or used like a collective noun, like "pack" in "a pack of dogs." "Pack" is singular, but it refers to many dogs. When you say, "are they eating her fruit?" the word "fruit" is being used like a collective. So it looks singular, but it refers to many items.