The word 'occurred' informs someone that something has come to mind or has been found. You are letting someone know that you suddenly have thought or remembered about something.

'occurred'这个词是告诉别人某事已经浮现到脑海或被发现，你在让别人知道你突然有想法或记得某事。

Here are some examples: 这里有一些例子：

"It occurred to me that I forgot your birthday."

我突然意识到，我忘记了你的生日。

"It occurred to me that we both belong to the same gym."

 我突然意识到，我们在同一个健身房。

"It occurred to me that we enjoy a lot of the same things."

 我突然意识到，我们有一些共同的爱好。

"It occurred to me the price for homes are more expensive here."

 我突然意识到，这里的房价很贵。

"It occurred to me that eating healthy makes me feel better."

 我突然意识到，吃得健康让我感觉更好。

Using the word 'had' or 'has' can change what you are saying to represent something remembered in a past time.

用'had'或者'has'这个词可以改变你所说的代表过去记得的某事。

Here are some examples: 这里有一些例子： 

"It had occurred to me that I forgot something at the grocery."

 我突然意识到，我把东西忘在杂货店了。

"It had occurred to me I might need to change my email address."

 我突然意识到，我可能需要修改我的邮箱地址。

"It has occurred to me I forgot my mom's birthday."

 我突然意识到，我忘记我妈妈的生日了。

"It has occurred to me before."

 我之前就意识到了。