My grammar book told me that when a participle functions as an adjective, normally it should be used before nouns. But I still saw some sentences like:
The experience gained will be of great value to us.
They decided to change the material used. (And they also said, the meaning is different with the prepositive"used" here means something which is used nowadays, but the prepositive one means second-hand)
When can we put participles after nouns and these different meanings of participles can be predicatives?