D. V. Demidov

5. Interrelation of Theoretical Grammar with other 
branches of linguistics.  
Theoretical grammar is obviously related to other branches 
of linguistics. First of all each of the three constituent parts of 
language is studied by a particular linguistic discipline. These 
disciplines, presenting a series of approaches to their particular 
objects of analysis, give the corresponding ―descriptions‖ of 
language consisting in ordered expositions of the constituent parts 
in question. Thus, the phonological description of language is 
effected by the science of phonology; the lexical description of 
language is effected by the science of lexicology; the grammatical 
description of language is effected by the science of gra mmar. 
Theoretical grammar is also connected with phonology, 
which can be proved by the fact that a word stress may change a 
part of speech. E.g.: to import (v) – ímport (n); to expórt (v) – 
éxport (n), etc. A change of intonation may change the 
communicative type of a sentence: We surrender (a declarative 
sentence) – We surrender?! (an interrogative-negative emotional 
sentence). 
Grammar is also related to lexicology: it is not indifferent 
as to the meaning of words: the meaning of a word may change 
the type of the predicate in a sentence. E.g.: a) He made a good 
report. b) He made a good reporter. In the first sentence we 

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observe a simple verbal predicate while in the second sentence we 
see a compound nominal predicate. 
Interrelation of theoretical grammar to practical one is also 
undisputable, but their purposes are different: the purpose of 
practical (or prescriptive) grammar is to prescribe the rules how to 
correct build sentences, or the Past Indefinite forms, or the plural 
number forms, etc., while the main purpose of theoretical 
(scientific, descriptive) grammar is to give a scientific description 
and analysis of the structure of Modern English and its 
grammatical categories along with the purpose of giving students 
a deeper insight into the mechanism, processes and tendencies in 
the grammatical structure of English.