How to Say "will become" in Spanish
The Spanish word for “will become” is “convertirá” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
verbB1
change of state or identity (uses 'se convertirá en')

Examples
Con mucho esfuerzo, ella se convertirá en una gran abogada.
With a lot of effort, she will become a great lawyer.
Si el clima sigue así, el río se convertirá en hielo.
If the weather continues like this, the river will turn into ice.
Using 'Se' and 'En'
When using 'convertirse' to mean 'to become,' you must use the reflexive pronoun ('se') and almost always follow it with the preposition 'en' (into): 'Se convertirá EN un monstruo'.
Missing the Reflexive Pronoun
Mistake: “Learners often forget the 'se' when meaning 'to become'.”
Correction: Say 'El proyecto SE convertirá en ley', not 'El proyecto convertirá en ley'.
Related Translations
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