The small number of class 8 verbs are a secondary group derived from class 5 roots .
Class 10 is a special case , in that any verb can form class 10 presents , then assuming causative meaning .
The small number of class 8 verbs are a secondary group derived from class 5 roots , and class 10 is a special case , in that any verb can form class 10 presents , then assuming causative meaning .