Miscellaneous not really an ODM mishmash

Question 1

Purists

Answer 1

want to protect English from foreign influences (eg. Americanisms)

Question 2

New/World Englishes

Answer 2

international varieties of English. Honestly, I think it probably wouldn’t be used for but could you use World English for BrE or AmE?

Question 3

World Standard English

Answer 3

Might be emerging as the different varieties grow closer together

Question 4

Bidialectalism

Answer 4

the ability to use two dialects of the same language (perhaps for different functions).

Question 5

Code-Switching

Answer 5

when somebody changes from one language or variety to another.