动名词做定语是不是只能放在修饰词的前面呢?我问的是动名词，不是现在分词，在非谓语中，动名词与现在分词不一样啊，看清楚，

一般情况是的，现在分词用定语如果是现在分词短语应该放在被修饰词之后，单个的分词也在前面。
如：sleeping bag 睡袋（动名词）
sleeping dog睡觉的狗（现在分词）
the dog sleeping under the tree,睡在树下的那只狗。（现在分词短语）

限定用法的ving称为现在分词,单字分词放在名词前(例1),但分词片语放在名词后(例2).类似情况亦适用於过去分词(例3.4)及形容词(例5.6).
1. The running boy is my younger brother.
2. The boy running over there is my younger brother.
3. The broken glass lay on the floor.
4. The glass broken by him lay on the floor.
5. The blind man wanted to see you.
6. The man blind in the right eye wanted to see you.