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

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

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

there be句型,是固定搭配必须动词ing否则造成双谓语

其实很简单, doing之前的动词是“is”, 所以 is + 动词ing形式。 不用每次都分析句子成分和所在位置是做什么修饰和修饰谁的。