Here's a breakdown:
* The major contributor: The most influential dialect was the East Midland dialect, which was spoken in the area around London. London's importance as the political, economic, and cultural center of England led to the East Midland dialect becoming dominant.
* Other influences: The other major dialects that influenced Modern English were:
* Northern English: Contributed words like "lass" and "lad".
* Southern English: Contributed words like "she" and "they".
* West Midland: Had a smaller influence, contributing words like "much" and "many".
It's important to note that Modern English did not simply replace these dialects. Rather, the East Midland dialect became the standard and absorbed features from the other dialects, leading to the development of a single, national language. This process was aided by the invention of the printing press and the standardization of spelling.
So, while Modern English has its roots in many dialects, the East Midland dialect, particularly the London variety, is considered the primary source.