[spyrja]

Actually, the introduction of Old Norse in Britain began in the early 5th century and by the time of Beowulf, Old English was still more than 90% a Nordic language. The Norman invasion of 1066 changed that dramatically (as Old French became the "new" official language) and to this day Modern English could reasonably be considered mostly French, then Latin, and only in small part Nordic (although the most common words used are by majority derived from Old Norse counterparts.) Oddly enough, only a few Celtic words made it into the language.

[nephihaha]

Germanic and Celtic languages have been in contact for at least two thousand years. Probably longer. There are Celtic loanwords in English which predate the Anglo-Saxon invasions. After the invasion, English took centuries to expand into areas which spoke P Celtic, and it seems to have profound influences on its verbal structure. Another wave of Celtic loanwords entered English via French.

As for modern English, there are numerous Celtic loanwords and calques in American, Canadian and Australian slang and dialect.

[antonvs]

Old English is not considered to have evolved from a Nordic language.

Old Norse was a North Germanic language. Old English was a West Germanic language. They were mutually intelligible to a significant degree, since both were Germanic languages that evolved from the hypothetical common ancestor Proto-Germanic, but saying Old English was "90% a Nordic language" is like saying that humans are 90% chimpanzees. Both evolved from a common ancestor, one did not evolve from the other.