You are letting someone know that you are aware of something or that you have been informed of something that is taking place. This could be something that has already happened or something happening in the near future. 'I've' is a contraction of the words 'I have.'

你是在让别人知道你知道某件事，或者你被告知正在发生的事情，这可能是已经发生的事情，或者在不久的将来发生的事情，'I've'是'I have'的缩写形式。

Here are some examples: 这里有一些例子： 

"I've heard that you got a new job."

 我听说你找到了新工作。

"I've heard that you want to leave your job."

 我听说你想要辞职。

"I've heard that you got a new car." 

我听说你买了一辆新车。

"I've heard that you like to jog."

 我听说你喜欢慢跑。

"I've heard that you fix computers."

 我听说你修理电脑。

"I've heard that you've never been to Canada."

 我听说你没去过加拿大。

"I've heard that you like to shop."

 我听说你喜欢购物。

"I've heard that you and your boss don't get along."

 我听说你和你的老板相处不好。

"I've heard that there is no school next week."

 我听说下周不上课。

"I've heard that your wife is a yoga instructor."

 我听说你的妻子是瑜伽教练。