English grammar is a description of the usages of the English language by good speakers and writers of the present day.—Whitney
A description of account of the nature, build, constitution, or make of a language is called its grammar—Meiklejohn
Grammar teaches the laws of language, and the right method of using it in speaking and writing.—Patterson
Grammar is the science of letter; hence the science of using words correctly.—Abbott
The English word grammar relates only to the laws which govern the significant forms of words, and the construction of the sentence.—Richard Grant White
These are sufficient to suggest several distinct notions about English grammar—
Synopsis of the above.
(1) It makes rules to tell us how to use words.
(2) It is a record of usage which we ought to follow.
(3) It is concerned with the forms of the language.