the Middle English period, many Old English grammatical features either became simplified or disappeared altogether. Noun, adjective, and verb inflections Middle English (abbreviated to ME) is the forms of the English language that were spoken in England after the Norman Conquest of 1066, until the late 15th century, roughly coinciding with the High and Late Middle Ages. The Middle English dialects evolved from Old English under the influence of Anglo-Norman French and Old Norse. They were eventually replaced in England by Early Modern English, in S Middle English (abbreviated to ME) is the forms of the English language that were spoken in England after the Norman Conquest of 1066, until the late 15th century, roughly coinciding with the High and Late Middle Ages. The Middle English dialects evolved from Old English under the influence of Anglo-Norman French and Old Norse. They were eventually replaced in England by Early Modern English, in Scotland by Early Scots, and in Ireland by Fingallian language and Yola language. The four main dialects in England were Northern, East Midland, West Midland, and Southern. Overall, Middle English exhibited significant regional variation and churn in its vocabulary, grammar, pronunciation, and orthography. During the Middle English period, many Old English grammatical features either became simplified or disappeared altogether. Noun, adjective, and verb inflections were simplified by the reduction (and eventual elimination) of most grammatical case distinctions. Middle English also saw considerable adoption of Anglo-Norman vocabulary, especially in the areas of politics, law, the arts, and religion, as well as poetic and emotive diction. Conventional English vocabulary remained primarily Germanic in its sources, with Old Norse influences becoming more apparent. Significant changes in pronunciation took place, particularly involving long vowels and diphthongs, which in the later Middle English period began to undergo the Great V Overall, Middle English exhibited significant regional variation and churn in its vocabulary, grammar, pronunciation, and orthography. During the Middle English period, many Old English grammatical features either became simplified or disappeared altogether. Noun, adjective, and verb inflections were simplified by the reduction (and eventual elimination) of most grammatical case distinctions. Middle English also saw considerable adoption of Anglo-Norman vocabulary, especially in the areas of politics, law, the arts, and religion, as well as poetic and emotive diction. Conventional English vocabulary remained primarily Germanic in its sources, with Old Norse influences becoming more apparent. Old Norse and Old English closely resembled each other, and with a lot of vocabulary and grammatical structures in common, speakers of each language roughly understood each other, but according to the historian Simeon Potler, the main difference lay in their inflectional endings, which led to much confusion within the mixed population that existed in the Danelaw, thus endings tended gradually to become obscured and finally lost, "simplifying English grammar" in the process, leading to the emergence of the analytic pattern. The dramatic changes that happened in English contribute to the acceptance of the hypothesis that Old Norse had a more profound impact on the development of Middle and Modern English than any other language. Viking influence on Old English is most apparent in pronouns, modals, comparatives, pronominal adverbs (like hence and together), conjunctions, and prepositions show the most marked Danish influence. The best evidence of Scandinavian influence appears in extensive word borrowings; however, texts from the period in Scandinavia and Northern England do not provide certain evidence of an influence on syntax. One argument is that, although Norse and English speakers were somewhat comprehensible to each other due to similar morphology, the Norse speakers' inability to reproduce the ending sounds of English words influenced Middle English's loss of inflectional endings. The combination of the last three processes listed above led to the spelling conventions associated with silent ⟨e⟩ and doubled consonants (see under Orthography, below). == Morphology == === Nouns === Middle English retains only two distinct noun-ending patterns from the more complex system of inflection in Old English: Nouns of the weak declension are primarily inherited from Old English n-stem nouns but also from ō-stem, wō-stem, and u-stem nouns, which did not inflect in the same way as n-stem nouns in Old English, but joined the weak declension in Middle English. Nouns of the strong declension are inherited from the other Old English noun stem classes. Some nouns of the strong type have an -e in the nominative/accusative singular, like the weak declension, but otherwise strong endings. Often, these are the same nouns that had an -e in the nominative/accusative singular of Old English (they, in turn, were inherited from Proto-Germanic ja-stem and i-stem nouns). The distinct dative case was lost in early Middle English, and although the genitive survived, by the end of the Middle English period only the strong -'s ending (variously spelled) was in use. (There was a fairly consistent correspondence between letters and sounds.) The irregularity of present-day English orthography is largely due to pronunciation changes that have taken place over the Early Modern English and Modern English eras. Middle English generally did not have silent letters. For example, knight was pronounced [ˈkniçt] (with both the ⟨k⟩ and the ⟨gh⟩ pronounced, the latter sounding as the ⟨ch⟩ in German Ich). The major exception was the silent ⟨e⟩ – originally pronounced but lost in normal speech by Chaucer's time. This letter, however, came to indicate a lengthened – and later also modified – pronunciation of a preceding vowel.