a computer bought是过去式还是过去分词

这个结构a computer bought并不完整，从这三个字来看bought应该是一个过去分词。

buy这个英语单词是一个不规则动词，它的过去式和过去分词都是bought。它的意思是“买”，很明显a computer不可以用作buy的主语，只能用作buy的宾语。因此a computer bought中bought只能是过去分词。

是过去分词，放在名词后作定语，中文意思是买的电脑

例如

She moved on to calculators and then to a computer she bought with money from her paper route.她后来修过计算器，再后来又修理了她用送报挣的钱所买的一台计算机。

Yet the First National Bank of Namibia， which bought the computer， is at the leading edge of a trend.