Best books for English Language Learners What are some of the best books for new English Language Learners? The English Tenses Practical Grammar Guide by. The Best ESL Textbooks for Adults Smart Choice: A Nice Pick for an ESL Textbook Smart Choice by Ken Wilson is a great choice if you want to make your classes interesting and educational with this ESL book for adults. Best ESL Textbooks for Teaching Adults “ESL Classroom Activities for Teens and Adults” by Shelley Ann Vernon Available on Amazon. At a Glance: Classroom activities aren’t just for kids, they’re for adults too! Just like younger learners, teens and adults learn better and more effectively when they’re engaged, interested and having fun.