Iknow没有简写的，它的汉语意思就是我知道，我明白，我懂得。

当你想要表达“我知道了”，你的第一反应是不是“I know”比如下面这些场景：

“Take your umbrella. It's raining.”

“I know!”

“The bus is coming!”

“I know!”

“The answer to the question is C.”

“I know!”

其实前面对话中的I know换成I see会更好些。