regret后接不定式时只限于以下动词say ,tell ,inform 表示遗憾地说.如,I regret to tell you that you didn't pass the exam.不能接其它的动词的不定式.它后面还可接动名词doing表示后悔做过某事.如Now I regret not taking your advice.我后悔没听你的建议.所以本句是说她坐在一块石头上不知道该怎么做,开始哭.动词wonder=want to know 想知道.对,疑惑