Questions & Answers about Mox puer fortis erit, et miles erit.
Erit is the future tense of esse (to be), in the third person singular: he/she/it will be.
So:
- est = is
- erit = will be
Because the sentence is talking about what the boy will be, Latin uses erit.
Yes, Latin could leave it out. A sentence like Mox puer fortis erit, et miles could still be understood as Soon the boy will be brave, and a soldier.
But repeating erit is perfectly normal and often clearer. It gives the sentence a balanced structure:
- puer fortis erit
- et miles erit
So the repetition is not wrong or strange; it is just explicit and neat.