如果你要表示“我取走了书包”，你可以说“I took the backpack.”这个短语来自英语中的动词“take”，意思是“取走，带走”。

例句：

I took the backpack and put it in my car. 我拿起书包放在车里。
She took the backpack and walked out of the classroom. 她拿起书包走出教室。
He took the backpack and left the house. 他拿起书包离开了房子。

希望这些例句能帮助你理解“I took the backpack.”这个短语的用法。