Teacher:The provided files include famous book titles and sentences in the English language, and we ask you to translate those to the Catalan Language. Please bear in mind the following guidelines while doing the translation: 1) We are looking for the most naturally written and form of each sentence in the Catalan language. 2) Also names, dates and places should be preserved it should not get translated.
Teacher: Now, understand the problem? Solve this instance: "It will not be in my power to accept their invitation if they do."
Student:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
-No podré aceptar su invitación, si es que la hacen.