Learn Spanish (Spain): La directora no lo acepta hasta que sea válido. - The director does not accept it until it is valid.

The phrase hasta que (until) triggers the subjunctive when it refers to an event that hasn't happened yet. Even though the main verb acepta (accepts) is in the present tense, the condition of the item being valid is still pending in the future, so we must use the present subjunctive sea.

The English translation says "until it is valid." Why does Spanish treat this as a pending future event?

In English, we often use the present tense after time words like "until" to talk about the future. Spanish is much stricter: if the event hasn't actually happened yet, time expressions like hasta que must be followed by the subjunctive to show that the outcome is still a future requirement rather than a current reality.

Why do we use a form of ser (sea) instead of estar with válido?

We use ser because being valid (válido) is treated as a defining characteristic, essential quality, or legal status of the item, rather than just a temporary physical condition or mood.

Why is the pronoun lo placed before the verb acepta?

As a quick refresher, direct object pronouns like lo (which means "it" in this sentence) must be placed immediately before the conjugated verb. Therefore, no lo acepta literally flows as "not it (she) accepts."