Certain morphemes replace parts of stems. These are structurally different from the additive morphemes, which are added to the stems.
- Nida (1949), a pag.71

Replacive morphemes may consist of any phonemic form. That is to say, they may be vowels, consonants, tones, nasalization, or combination of such segmental and suprasegmental features. In English replacive morphemes are abuntantly illustrated in the verbs which undergo a change of syllabic in the past-tense and participial formations, but they also occur in other structures.
- Nida (1949), a pag.72