i forgot to tell you .的词态,达人进 urgent

题目

i forgot to tell you .的词态,达人进 urgent
说话情景是这样的：我和一个外国人聊天,一开始,他用中文跟我说,说着说着,我想用英语跟他聊,请问我该选择以下哪种情况：
i forgot to tell you that i can speak English.我忘了告诉你,我会说英语
i forget to tell you that i can speak English 我忘了告诉你,我会说英语
i have forgotten to tell you that i can speak Enlish
我纵观很多例句,都是用第一种,说忘了是在说话之前,是过去式forgot.
因为忘记已经发生了.但我觉得用第二种和第三种也可以
请达人说明原因,

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