不定式与现在分词做后置定语的区别

不定式做后置定语,表示将要做（还没有做）
I have something (to do this evening).
2.现在分词做定语时,位置不定,如果是一个现在分词,前置,如果是短语后置.表主动.
The (flying )kites are high in the sky.
The boy (sitting by the window )is Tom.
现在分词作后置动词不定式作定语应注意：
1.表示将要发生的动作,有时根据句意需要加上介词,这时介词不能省略,因为被修饰的名词是它的宾语.
例The farmers thought of ways to protect their crops.
We have only a small cold room to live in.
2.用于修饰被序数词、最高级或no,all,any等限定的中心词.
例 Marie Curie became the first woman in France to be a university professor.
She was the first person in the word to receive two Nobel Prize.
He was the best man to do the job.
3.根据不同的句意,不定式可用主动语态或被动语态.
例 Have you got anything to post?(post的动作执行者是“你”)
Have you got anything to be posted?(post的动作执行者是“我”或“别人”)
There are some plates to wash (to be washed).
定语,表示与主句时态一致的一个经常发生的动作

不定式to do 表示即将发出的动作，现在分词doing表示正在进行的动作