如果你想问"我买了苹果，怎么用英语表达？"，那么你可以这样说：
"I bought an apple. How do I say that in Engpsh?"
如果你想表达自己已经买了苹果，你可以这样说：
"I have bought an apple."
或者：
"I have purchased an apple."
"I bought an apple. How do I say that in Engpsh?"
如果你想表达自己已经买了苹果，你可以这样说：
"I have bought an apple."
或者：
"I have purchased an apple."