The following ESL resources are available for Register (spoken):
Ss match formal and less mormal lines from two similar dialogues.
Two ways of making a number of simple announcements
Explanation and examples of these two concepts with a short (7-question) multiple-choice exercise on register.
General English course books (adults)
Unit 2 Family Page 22 (1) Ss read and listen to 2 short dialogues with different register. (2) Compare words and phrases. (3) Role play (choice of two situations)
Unit 2 Generations Page 20 Reading and listening Two dialogues in different register following on from previous material:
1 - boyfriend / girlfriend (informal)
2 - boyfriend / girlfriend's parents (more formal)