Theoretical grammar as a branch of linguistics

Theoretical grammar as a branch of linguistics
The object of theoretical grammar as a science is the grammatical structure of language, i.e. the system of laws governing the change of grammatical forms of words and the building of sentences.
Grammar of a language is not a list of rules forced on people who speak it. It is just a record made by careful observation of how people speak a language.
Laws of grammar are objective. They can be compared with those of nature. Law of nature are a few things that people have observed as the way nature acts. If we find that nature is now acting according to these rules, we do not try to force nature to obey them. We change our ideas about nature and discover new laws.
It’s the same with grammar. English of today is not quite the same English as English of 17th century. What was good grammar for Shakespeare could he had grammar for shaw.
The main difference between the grammatical structure of English and that of Russian and Ukrainian lies in ways of expressing grammatical relations between words in word-groups and sentences. In Ukrainian or Russian grammatical relations between words in a sentence are mainly expressed by forms of the words. Such a type of grammatical structure is called analytical.
Practical (normative) grammar is a collection of rules, which will enable one to speak and write correctly.
Theoretical (scientific) grammar is a scientific description of grammatical structure of a language.
Practical grammar is dogmatic to same extent.
Theoretical grammar is connected with phonology, lexicology and the history of language.
Traditionally grammar is divided into morphology and syntax.
Morphology (which means “study of law”) is the part of grammar that treats of forms of words. Syntax is the part of grammar that of phrases and sentences. Morphology and syntax are closely connected and it’s impossible to draw precise boundaries between them.