定语从句简化时中,去掉关系词后，后面的动词要变成ing形式这种情况是现在分词作后置定语如The boy standing at the door is my brother.现在分词作后置定语表示和被修饰词之间的主动关系。=The boy who is standing at the door is my brother.下面这几个也是作定语的非谓语动词，注意它们的区别。the food bought in this supermarket is good.
bought in this supermarket与被修饰词之间是被动关系。=the food which/that was bought in this sup...
