如果我有必要参加考试，这个阶段是我会认真准备考试的时候。
If I have to take exams, this is the stage when I would prepare in earnest for them.
如果我有必要参加考试，我会在这个阶段认真准备考试。
If I were, this is the stage when I would prepare in earnest for them.
莫莉：我对参加考试很认真，我已经够聪明的了。
Molly: I am serious about acing the test, but I am already smart enough.
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