Modern English
Modern English (sometimes New English or NE as opposed to Middle English and Old English) is the form of the English language spoken since the Great Vowel Shift in England, which began in the late 14th century and was completed in roughly 1550.
History of English grammars
It was during the nineteenth century that modern-language studies became systematized. In the case of English, this happened first in continental Europe, where it was studied by historical and comparative linguists. In 1832, Danish philologist Rasmus Rask published an English grammar, "Engelsk Formlære", part of his extensive comparative studies in the grammars of Indo-European languages. German philologist Jacob Grimm, the elder of the Brothers Grimm, included English grammar in his monumental grammar of Germanic languages, "Deutsche Grammatik" (1822–1837). German historical linguist Eduard Adolf Maetzner published his 1,700 page "Englische Grammatik" between 1860 and 1865; an English translation, "An English grammar: methodical, analytical and historical" appeared in 1874. Contributing little new to the intrinsic scientific study of English grammar, these works nonetheless showed that English was being studied seriously by the first professional linguists.