Adjetivo y pronombre
Todo is a very common and versatile word in Spanish. It can be used as an adjective or as a pronoun.
Like other Spanish adjectives and pronouns, todo has different forms to agree in gender and number with the noun it modifies or replaces:
|Todos los libros||All the books / Every book|
|Todo el mundo||Everyone (lit. "all the world")|
|Toda la clase||The whole class|
|Todas las chicas||Every girl / All the girls|
|Todos los días||Every day|
|Todos mis perros||All my dogs|
When todo is used as a pronoun, it means "everyone" or "everything."
|Todo es importante.||Everything is important.|
|Todos estudian.||Everyone is studying.|
|¡Quiero comprar todo!||I want to buy everything!|