Si tenemos el presupuesto, firmamos con tal de que modifiques la condición.

Questions & Answers about Si tenemos el presupuesto, firmamos con tal de que modifiques la condición.

Why is modifiques in the subjunctive here?
The phrase con tal de que means 'provided that' or 'as long as'. It sets a strict condition that must be met for the main action (firmamos) to happen. Because this condition is a hypothetical requirement, it always forces the following verb into the subjunctive.
Why is modifiques spelled with a 'qu' instead of a 'c'?
The verb is modificar. When forming the present subjunctive, the ending changes to an 'e'. To keep the hard 'k' sound from the original verb, the 'c' must change to 'qu'. If you wrote modifices, it would be pronounced with an 's' sound.
The English translation says 'we will sign', so why does the Spanish use the present tense firmamos?
In Spanish, the present tense is often used instead of the future tense to show a strong commitment or an immediate consequence. Saying firmamos makes the promise sound more certain and immediate than the future tense firmaremos would, though both are grammatically correct here.
Since the whole sentence is about conditions, why is tenemos in the normal present tense instead of the subjunctive?
The word si (if) behaves differently than strict conditional phrases like con tal de que. When a si clause talks about a realistic, possible condition in the present or future (like having the budget), it always takes the regular present indicative tense, never the present subjunctive.

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