We may [...] consider the formal methods employed by a language, its 'grammatical processes'[...]
- Sapir (1921), a pag.57

Every language possesses one or more formal methods for indicating the relation of a secondary concept to the main concept of the radical element. Some of these grammatical processes, like suffixing, are exceedingly widespread; others, like vocalic change, are less common [...] others, like accent and consonantal change, are somewhat exceptional [...]
- Sapir (1921), a pag.59

[...] all languages evince a curious instinct for the development of one or more particular grammatical processes at the expenses of others [...]
- Sapir (1921), a pag.60

[...] the various grammatical processes [...] may be grouped into six main types: word order; composition; affixation, including the use of prefixes, suffixes, and infixes; internal modification of the radical or grammatical element, whether this affects a vowel or a consonant; reduplication; and accentual differences, whether dynamic (stress ) or tonal pitch.
- Sapir (1921), a pag.61