Additive morphemes are outer grammatical suffixes, since, as a rule, they are opposed to the absence of morphemes in grammatical alternation.
look+ed;
small+er,
The root phonemes of grammatical interchange are considered as replacive morphemes, since they replace one another in the paradigmatic forms.
dr-i-ve — dr-o-ve — dr-i-ven;
m-a-n — m-e-n; etc.
This type of grammatical means can be understood as a kind of partial suppletivity (÷àñòè÷íûé ñóïïëåòèâèçì).
V) according to linear characteristic (ëèíåéíàÿ õàðàêòåðèñòèêà)