razonarán
-they will reason
The word razonarán is the future form of razonar in the third person plural.
See the full razonar conjugation

razonar

Que no os nublen la mente aquellas personas que son escépticas, aquellas que razonarán con todo el conocimiento científico intelectual, que no es nada.
Do not have your minds clouded by those who are skeptic, those who will reason with all man's scientific intellectual knowledge, which is as nothing.
Sin embargo, les pediría que razonaran sobre tres cosas.
There are, however, three things I should like to ask you to consider.
Las personas involucradas en la guerra, eran afortunadas si sus líderes razonaran así, y desafortunadas si ellos se desvían de este razonamiento.
Peoples engaged in war, are fortunate if their leaders reason like this, and unfortunate if they deviate from this reasoning.
Si los animales razonaran, ¿qué deberían pensar de nosotros? Mirad uno de esos grandes vapores surcando el Atlántico contra el viento, contra las olas, absolutamente dispuesto a desafiar el supremo poder de los elementos.
If the animals can reason what must they think of us? Look at one of those great ocean steamers ploughing her way across the Atlantic, against wind, against wave, absolutely setting at defiance the utmost power of the elements.
Y los padres dicen que si los jóvenes son muy desenfrenados en su adolescencia se corregirán más tarde, y que cuando tengan dieciséis o dieciocho años razonarán por su cuenta, abandonarán sus malos hábitos y llegarán por fin a ser hombres y mujeres útiles.
And if very wild in youth, parents say they will come right after a while and, when sixteen or eighteen years of age, will reason for themselves and leave off their wrong habits and become at last useful men and women.
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