实创佳人
1.I regret doing things that must't be done.(应该用被动，事情只可能是被做)2.I remind you of that he was a thief.(这里是告诉一个事实，而不是一种状态，所以用一般过去时，而不用完成时)3.You needn't feel nervous for this thing.(在这里need做了情态动词，后面接动词原型)祝你学习进步，快乐！
晓晓彤儿
1.I regret that I have down something I shouldn't do it.我后悔做了不应该做的事情.2.I remind you that he is theif.我提醒你他是一个小偷.3.you have not need to feel nervous for this thing.你不必再为这件事感到不安.
大眼博奇
1,2正如前面说说的.3是YOU DO NOT NEED TO FEEL NERVOUS FOR THIS THING,因为needn't have done是本无需做某事的意思.
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