This is the 12354th most frequent Spanish word.
llueve
"It rains."
Here, the word 'llueve' is used as the main verb of the sentence, describing the action of raining.
Llueve mucho en primavera.
It rains a lot in spring.
In this sentence, 'llueve' functions within a subordinate temporal clause to set a condition for the main clause.
Cuando llueve, me gusta leer un libro.
When it rains, I like to read a book.
Here, 'llueve' is again in a temporal subordinate clause, used to pose a condition in a question.