English language learners (ELLs) are students who are learning English and mastering academic content at the same time. There are approximately 140,000 ELLs in the city’s public schools, and they are a diverse group. Among them, they speak some 158 languages. Some are newly arrived from other countries; others were born and raised in New York speak a language other than English at home. They are in every grade and every borough. It is a rare teacher that does not have at least a few ELLs in class.