Sequence of Tenses: Translating the subjunctive
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This is probably a pretty basic question, but I am new to Latin and am having trouble understanding the subjunctive. The sentence "Pūgnāverō ut nautam superem" is translated to "I shall have fought in order that I may overcome the sailor" (according to my textbook). I understand that pūgnāverō is active, indicative, future perfect, first person, singular, which so far I would have believed to be translated as "I will have fought (already)." I am confused because my book uses the word "shall," which to me signals that it is subjunctive. My questions are: Am I misunderstanding the way "shall" is used? Is this something that only occurs in clauses of purpose, i.e., is this occurring because "superem" is subjunctive? There is a similar post here, ...