我保证不会再发生这样的事了，英语翻译可以这么说：I'm sure it won't happen again.见下图
我在国外定居，老外一般这么说：
I guarantee that it/this will never happen again. 我保证这（事）永远不会再次发生了
I promise that this will not be happened .
I promise that the situation will never happen again.
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