"Because" is a conjunction which is often translated as "porque", and "become" is a copular verb which is often translated as "convertirse en". Learn more about the difference between "because" and "become" below.
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A copular verb links the subject of a clause to the predicate (e.g. My brother is tall).
1. (to come to be)
a. convertirse en
He became the most influential director on the board.Se convirtió en el director más influyente de la junta.
He became distant and didn't contact her for nearly a week.Se volvió distante y no la contactó durante casi una semana.
After many years of study, he finally became a lawyer.Después de muchos años de estudio, finalmente se hizo abogado.
d. llegar a ser
There's a chance he could become the country's next prime minister.Es posible que llegue a ser el próximo primer ministro del país.
2. (to enter into a physical or emotional state)
3. (to transform into)
A transitive verb is a verb that requires a direct object (e.g. I bought a book.).
4. (to suit)
5. (to be appropriate of)