It's about PHONOLOGY ( syntax)

Definition:

(1) In linguistics, the study of the rules that govern the ways in which words combine to form phrases, clauses, and sentences. Syntax is one of the major components of grammar.

(2) The arrangement of words in a sentence. Adjective: syntactic.

# Within traditional grammar, the syntax of a language is described in terms of a taxonomy (i.e. the classificatory list) of the range of different types of syntactic structures found in the language. The central assumption underpinning syntactic analysis in traditional grammar is that phrases and sentences are built up of a series of constituents (i.e. syntactic units), each of which belongs to a specific grammatical category and serves a specific grammatical function. Given this assumption, the task of the linguist analysing the syntactic structure of any given type of sentence is to identify each of the constituents in the sentence, and (for each constituent) to say what category it belongs to and what function it serves. . . .

"In contrast to the taxonomic approach adopted in traditional grammar, [Noam] Chomsky takes a cognitive approach to the study of grammar. For Chomsky, the goal of the linguist is to determine what it is that native speakers know about their native language which enables them to speak and understand the language fluently: hence, the study of language is part of the wider study of cognition (i.e. what human beings know). In a fairly obvious sense, any native speaker of a language can be said to know the grammar of his or her native language."
(Andrew Radford, English Syntax: An Introduction. Cambridge Univ. Press, 2004)


# "Syntax is the study of the principles and processes by which sentences are constructed in particular languages. Syntactic investigation of a given language has as its goal the construction of a grammar that can be viewed as a device of some sort for producing the sentences of the language under analysis."
(Noam Chomsky, Syntactic Structures, 1971)


# Syntactic Changes in English
"Syntactic change--change in the form and order of words--is . . . sometimes described as 'an elusive process as compared to sound change.' Its apparently puzzling nature is partly due to its variety. Word endings can be modified. Chaucer's line And smale foweles maken melodye shows that English has changed several of them in the last 600 years. The behaviour of verbs can alter. Middle English I kan a noble tale 'I know a fine story' reveals that can could once be used as a main verb with a direct object. And word order may switch. The proverb Whoever loved that loved not at first sight? indicates that English negatives could once be placed after main verbs. These are just a random sample of syntactic changes which have occurred in English in the last half-millennium or so."
(Jean Aitchison, Language Change: Progress or Decay? 3rd ed. Cambridge Univ. Press, 2001)


# William Cobbett on Syntax (1818)
"Syntax is a word which comes from the Greek. It means, in that language, the joining of several things together; and, as used by grammarians, it means those principles and rules which teach us how to put words together so as to form sentences. It means, in short, sentence-making. Having been taught by the rules of Etymology what are the relationships of words, how words grow out of each other, how they are varied in their letters in order to correspond with the variation in the circumstances to which they apply, Syntax will teach you how to give all your words their proper situations or places, when you come to put them together into sentences."
(William Cobbett, A Grammar of the English Language in a Series of Letters: Intended for the Use of Schools and of Young Persons in General, but More Especially for the Use of Soldiers, Sailors, Apprentices, and Plough-Boys, 1818)