This is the 277th most frequent Spanish word.
necesario
Necessary.
In this sentence, 'necesario' is used as an impersonal expression to indicate a general necessity or requirement for studying every day.
Es necesario estudiar todos los días para mejorar.
It is necessary to study every day to improve.
Here, 'necesario' functions as an adjective to describe the importance of a book that is essential for a specific context.
Hace falta un libro necesario para el curso de matemáticas.
A necessary book is required for the mathematics course.
In this example, 'necesario' again serves as an impersonal expression, emphasizing that arriving early is not a requirement in this instance.