Past simple: British pop stars were famous all over the world.
Present simple: British pop stars are famous all over the world.
Future simple: British pop stars will be famous all over the world
С общим вопросом: Are British pop stars famous all over the world?
Со спец. вопросом: Why are British pop stars famous all over the world?
Past simple: British pop stars were famous all over the world.
Present simple: British pop stars are famous all over the world.
Future simple: British pop stars will be famous all over the world
С общим вопросом: Are British pop stars famous all over the world?
Со спец. вопросом: Why are British pop stars famous all over the world?