Earl W. Stevick, Adapting and Writing Language Lessons… (1971)
“ The object prefix follows the subject prefix and stands immediately before the stem: The most striking difference in the use of subject and object prefixes is that the subject prefix must be used whether or not there is an explicit noun subject, while the object prefix is not often used unless the noun object itself is omitted. In this respect the object prefix of a Bantu verb is similar to the object pronouns of many European languages. ”
