I had never studied so much in preparation for a class.
我从来没有为了一堂课事先做这么多的预习。
I think I actually always had that sound in my head to begin with3, even though I had never studied it. It was a sound I recognized.
我想实际上那个声音从一开始就一直在我的脑子里，即使我从没有学过木琴，但那个声音我本来就认识。
If I had not studied English, I would never be here to teach you grammar today.
如果我没有学过英语，我现在就不能在这里教你们语法了。
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