How to Say "you'll say" in Spanish
The Spanish word for “you'll say” is “dirás” — B1 level. This is a very common word in everyday Spanish.

Examples
Mañana le dirás la verdad, ¿verdad?
Tomorrow you will tell him the truth, right?
Cuando lo veas, ¿qué dirás?
When you see him, what will you say?
Si no lo estudias ahora, dirás que es muy difícil después.
If you don't study it now, you'll say it's very difficult later.
Irregular Future Stem
The verb 'decir' (to say/tell) is very irregular in the future tense. Instead of using the full verb 'decir' plus the ending, it shortens and changes its stem to 'dir-'. This form, 'dirás,' means 'you will say/tell.'
Future Tense for Probability
Sometimes the future tense is used not for future time, but to guess or wonder about the present. For example, '¿Qué dirás que cuesta?' means 'How much do you suppose it costs?'
Forgetting the Irregularity
Mistake: “Using the regular conjugation: 'decirás'”
Correction: Always use the irregular stem 'dir-' for the future tense: 'dirás'. This is one of the ten most common irregular future verbs!
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