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serás el primero

you'll be the first

→ ser
phrase Very common #910
you'll be the first Future tense of ser. Used to say that someone will be first to do something, know something, arrive, or be chosen.
SP: Serás el primero en verlo.
EN: You'll be the first to see it.

Si no, jamás serás el primero.

Otherwise, you'll never be first.

— Los cuatrocientos golpes (1959)

Serás el primero en saberlo.

You'll be the first to know.

Tú serás el primero.

You will be the first.

Porque serás el primero en rendirte.

Because you'll be the first to give up.

— Tropa de élite (2007)

Serás el primero, ¿estás en posición?

You'll be the first; are you in position?

— Taxi Express (1998)

No serás el primero.

You won't be the first.