If there is someone doing better than we are.为什么用doing

题目

If there is someone doing better than we are.为什么用doing

答案

doing 是现在分词,作定语,修饰someone;someone doing 意义上（即逻辑上）是主谓关系,所以用现在分词.举例：There are twenty students playing football on the playground.（=There are twenty students who are playing football on the playground.相当于定语从句.）