The three masculine forms keep the derived participle's stem while varying the ending for number.
Word / formMeaning / explanation
مَنْصُورٌone man who received help.
مَنْصُورَانِtwo men who received help.
مَنْصُورُونَmen who received help.
مَضْرُوبٌone man who was struck.
مَضْرُوبَانِtwo men who were struck.
مَضْرُوبُونَmen who were struck.
The endings -āni and -ūna distinguish dual and masculine plural. They do not turn the receiver into the doer.