Completion count: 27,140
2143 online multiple-choice and fill-in-the-blank a vs an exercises across 101 tests provide a wide range of sentences to help you grasp the context and usage/formation of the a an. Prepare for exams, practice a an online and verify your answers immediately. Expand your English grammar proficiency with interactive a or an activities. Suitable for kids, adults, ESL learners at the beginner, elementary, and intermediate levels.