A lot of teachers will find they have to teach younger people however many more will also be teaching adults. This is obviously true with regards to those within the world of business English. How to Become an Adult Education Teacher. Adult educators work in community colleges, community organizations, or prisons, English as a Second Language. Adult literacy and high school equivalency diploma teachers instruct adults in basic skills, such as reading, writing, and speaking English. They also help students earn their high school equivalent diploma.