如果您想表示已经买完了这些东西，可以用英语说："I have bought these." 或者 "I have completed the purchase of these items."

这句话的来源是英语动词 "buy" 的过去式，表示已经完成了购买动作。

下面是一些可以使用这句话的英文例句，以及它们的中文翻译：

"I have bought these groceries. Can you help me carry them to the car?"
(我已经买了这些杂货。你能帮我把它们拿到车里吗？)

"I have bought a new phone. It's the latest model and has all the features I wanted."
(我已经买了一部新手机。这是最新款的，有我想要的所有功能。)

"I have bought tickets for the concert. Can you come with me?"
(我已经买了音乐会的门票。你能和我一起去吗？)

希望这些信息对您有帮助。