核心问题
These both books are useful. Her both parents are dead. (这两本书都有用。她的双亲都去世了)。请问这两个句子都有错误吗？
词典解答
这两个句子都有错误。both如同all一样，必须放在定冠词、物主代词或指示代词之前，而不能放在它们的后面，这一点跟汉语恰好相反。
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Both the brothers are students. 兄弟两人都是大学生。
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Both these children laughed. 这两个孩子都笑了。
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He has bought both her books. (Yeats) 他把她的两本书都买下来了。