Modifico el contrato con tal de que aceptes la condición.

Questions & Answers about Modifico el contrato con tal de que aceptes la condición.

Why is aceptes in the subjunctive here instead of the normal present tense aceptas?
The phrase con tal de que (as long as / provided that) always triggers the subjunctive. This is because it sets up a strict condition that hasn't necessarily happened yet. You are saying the contract modification depends on this requirement being met, rather than stating their acceptance as a confirmed fact.
Could I use siempre que or siempre y cuando instead of con tal de que in this sentence?
Absolutely. You could say siempre que aceptes or siempre y cuando aceptes. All three expressions mean "as long as" or "provided that," and all of them require the subjunctive. Con tal de que can sometimes feel just a bit stronger, like saying "on the strict condition that" or implying a compromise.
Why use the present tense modifico (I modify) instead of the future tense modificaré (I will modify)?
In Spanish, the present tense is often used to make a firm promise, an immediate offer, or state a standing rule. Saying Modifico el contrato feels like "I'm changing it right now" or "I am willing to change it." You can definitely use the future tense (Modificaré el contrato...) instead if you want, and the second half of the sentence would stay exactly the same.
Do I always need the de in con tal de que?
Grammatically, yes. You will sometimes hear native speakers drop the de and say con tal que in everyday, casual speech. However, the technically correct phrase to learn and use in writing is con tal de que.

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