Historical Background of British and American EnglishThe history of the English language is divided into three periods: The period from 450 to 1150 is known as the Old English
It is described as the period of full inflections(词尾变化), since during most of this period the case ending of the noun, the adjective and the conjugation(结合) of the verb were not weakened
Old English was a highly inflected language
It had a complete system of declensions(变格) with four case and conjugations
So Old English grammar differs from Modern English grammar in these aspects(方面)
The period from 1150 is known as the Middle English period
It is know as the period inflections
This period was marked by important changes in the English language
The Norman Conquest was the cause of these changes
The change of