The smiling boy needs a pen bought by his mother.
该句的smiling是目前分词作前置定语修饰boy，bought by hismother是过去分词短语作后置定语修饰the pen。
请问老师，分词作定语一般是前置还是后置？还是都可以？
The smiling boy needs a pen bought by his mother.
句中的smiling是目前分词作前置定语修饰boy——单个的目前分词定语一般置于被修饰名词之前。
bought by his mother是过去分词短语作后置定语修饰the pen——过去分词短语作定语，一般置于被修饰名词之后。