"to be getting ready to do something" 是一个常用的短语，表示准备做某事。

例如：

I'm getting ready to go to work. (我正在准备去上班。)
She's getting ready to leave for her trip. (她正在准备离开旅行。)
They're getting ready to have a meeting. (他们正在准备开会。)

另外一种说法是 "to prepare to do something"，表示准备做某事。

例如：

He is preparing to take his final exam. (他正在准备参加期末考试。)
She is preparing to run a marathon. (她正在准备参加马拉松比赛。)
We are preparing to move to a new city. (我们正在准备搬到一个新城市。)

来源:

"to be getting ready" 是一个习语，它来源于英语中"get" 的意思是"变得"或"成为"，"ready" 意思是"准备好的"，这两个词结合在一起，表示"变得准备好"。
"to prepare" 是一个动词，它来源于拉丁语 "praeparare" ，意思是"准备"。