Head-marking language
Grammar where inflection "agrees" with primary components of phrases
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In English
The concepts of head-marking and dependent-marking are commonly applied to languages that have richer inflectional morphology than English. There are, however, a few types of agreement in English that can be used to illustrate those notions. The following graphic representations of a clause, a noun phrase, and a prepositional phrase involve agreement. The three tree structures shown are those of a dependency grammar, as opposed to those of a phrase structure grammar:
Heads and dependents are identified by the actual hierarchy of words, and the concepts of head-marking and dependent-marking are indicated with the arrows. Subject-verb agreement, shown in the tree on the left, is a case of head-marking because the singular subject John requires the inflectional suffix -s to appear on the finite verb cheats, the head of the clause. The determiner-noun agreement, shown in the tree in the middle, is a case of dependent-marking because the plural noun houses requires the dependent determiner to appear in its plural form, these, not in its singular form, this. The preposition-pronoun agreement of case government, shown in the tree on the right, is also an instance of dependent-marking because the head preposition with requires the dependent pronoun to appear in its object form, him, not in its subject form, he.
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Noun phrases and verb phrases
The distinction between head-marking and dependent-marking shows the most in noun phrases and verb phrases, which have significant variation among and within languages.
Languages may be head-marking in verb phrases and dependent-marking in noun phrases, such as most Bantu languages, or vice versa, and it has been argued that the subject rather than the verb is the head of a clause so "head-marking" is not necessarily a coherent typology. Still, languages that are head-marking in both noun and verb phrases are common enough to make the term useful for typological description.
Geographical distribution
Head-marked possessive noun phrases are common in the Americas, Melanesia, Afro-Asiatic languages (status constructus) and Turkic languages but infrequent elsewhere. Dependent-marked noun phrases are in complementary distribution, being frequent in Africa, Eurasia, Australia, and New Guinea (the only area in which both types overlap appreciably). Double-marked possession is rare but can be found in languages around the Eurasian periphery such as Finnish, in the Himalayas, and along the Pacific Coast of North America. Zero-marked possession is also uncommon, with instances mostly found near the equator, but it does not form any true clusters.
The head-marked clause is common in the Americas, Australia, New Guinea, and the Bantu languages but is very rare elsewhere. The dependent-marked clause is common in Eurasia and Northern Africa, sparse in South America, and rare in North America. In New Guinea, it clusters in the Eastern Highlands and in Australia in the south, east, and interior with the very old Pama-Nyungan family. Double-marking is moderately well attested in the Americas, Australia, and New Guinea, and the southern fringe of Eurasia (chiefly in the Caucasian languages and Himalayan mountain enclaves), and it is particularly favored in Australia and the westernmost Americas. The zero-marked object is unsurprisingly common in Southeast Asia and Western Africa, two centers of morphological simplicity, but it is also very common in New Guinea and moderately common in Eastern Africa and Central America and South America, among languages of average or higher morphological complexity.
The Pacific Rim distribution of head-marking may reflect population movements beginning tens of thousands of years ago and founder effects. Kusunda has traces in the Himalayas, and there are Caucasian enclaves, both of which are perhaps remnants of typology preceding the spreads of interior Eurasian language families. The dependent-marking type is found everywhere but rare in the Americas, possibly another result of founder effects. In the Americas, all four types are found along the Pacific Coast, but in the East, only head-marking is common. Whether the diversity of types along the Pacific Coast reflects a great age or an overlay of more recent Eurasian colonizations on an earlier American stratum remains to be seen.