急！！请问“超越自己的权限做某件事”用英语怎么表达？就是所谓“越权”。在线等，现场拍板！

You have exceeded your authority by doing sth.
你已越权…了。
exceed one's power to do/by doing sth.
越权做某事

be far beyond one's capacity

"Exceeding their authority to do something"

to exceed one's powers to do sth

do sth out of one's hand