请教下懂英语的老师看下这句子语法有没错,

题目

请教下懂英语的老师看下这句子语法有没错,
I not only believe that the advandages of Internet outweigh the disadvantages of Internet ,but also I believe that Internet will play a more and more important role in the 21st century.
怎么该对啊,我不会看额,怎么都不一样啊

答案

应该这样表达：
I believe not only that the advandages of Internet outweigh the disadvantages of Internet ,but also that Internet will play a more and more important role in the 21st century.