非谓语动词：不定式和现在分词作后置定语的区别?

动词不定式作定语后置表示要做的事（尚未发生）,常与名词有动宾关系,不及物动词加介词.
The farmers thought of ways to protect their crops. 【protect their crops还没有开始实行】
现在分词作定语后置表示名词性质、特征或表示名词所做的动作（多表示进行、主动）.
People waiting for the bus often shelter in my doorway【 waiting 是people正在做的动作】
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现在分词做后置定语表示主动和进行，如：the boy lying on the ground ; the problem being discussed 在这种情况下，可以和定语从句进行转换，如：the boy who lies on the ground或the boy who is lying on the ground; the problem which is being discusse...