An English teacher in Brazil notices that some students use informal expressions like "ain't" instead of "isn't/aren't" during oral activities. From the perspective of English as a lingua franca, the most appropriate approach would be to:
An English teacher in Brazil notices that some students use informal expressions like "ain't" instead of "isn't/aren't" during oral activities. From the perspective of English as a lingua franca, the most appropriate approach would be to:
