我不理解英语翻译

I don't understand 或者 I can't understand 都可以。

Don't understand 这个最直接了

我不懂英语英文：I don't know English。懂动词：（知道； 了解） understand； know I know no English, much less French. 我不懂英语, 法语就更不懂了.My friend doesn't understand English, so I act as interpreter. 朋友不懂英语, 我充当翻译.

I don't understand.

我不能够理解这句话的意英语：1) I can't understand what you mean.2) I don't understand what the sentence means.

要结合具体语境翻译的。比如“这个问题我不能理解”可以翻译成“I can't understand this question.” 又比如"这件事我弄不明白“可以翻译成”I can't make sense of it.“等等