Some Auras and Equipment grant abilities to creatures, meaning the affected creature would no longer get the +2/+2 bonus. For example, Flight grants flying to the enchanted creature. Other Auras and Equipment do not, meaning the affected creature would continue to get the +2/+2 bonus. For example, Dehydration states something now true about the enchanted creature, but doesn't give it any abilities. Auras and Equipment that grant abilities will use the words "gains" or "has," and they'll list a keyword ability or an ability in quotation marks.