我早就知道英文

没有，这个是虚拟语气，与现在事实相反，应该用，if i have known

In fact, I already know who you are

I'v got it for a long time 希望能帮助到您 谢谢

I knew it

I have already known that for a long time.

其实我早就知道你是谁了翻译成英文是：In fact, I knew who you were earlier.相关短语学习：in fact 英[in fækt] 美[ɪn fækt] [词典] 事实上; 实际上，其实; 实则; 说起来; [例句]You have to admit that you are, in fact, in difficulties你不得不承认，你事实上是陷入了困境。