A conditional sentence has at least two parts. The "if-clause", which describes the conditions that allow something to happen, is called the protasis in formal Latin Grammars. That means that it is something which is "set out first." The main clause, sometimes introduces with "then" in English, is called the apodosis in formal grammar. That means something that is granted after. If you're happy (protasis), I'm happy (apodosis). This page contains more information on conditional sentences in Latin
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