The No Child Left Behind (NCLB) Act exhibits three potential problems in English education in the U.S. from the perspectives of both students and teachers. Firstly, NCLB reduces English language learners' (ELLs) motivation to learn English because of the tedious learning environment. Under NCLB, according to the state's requirement of ELLs' academic performance, English teachers have to input knowledge to ELLs in a traditional way, such as rote memorization, instead of spending time using some enlightening language learning strategies. Secondly, NCLB may ignore to cultivate ELLs' critical thinking during learning English. In order to avoid receiving federal sanctions, English educators may solely focus on ELLs' academic development. However, for ELLs, the understanding of the U.S. cultures is very important, which is helpful to cultivate critical thinking through the comparison between the U.S. cultures and their own cultures. Moreover, except for ELLs, NCLB damages English teachers' passion for English education. According to the state's requirement, teachers have few chances to show their personal identity through their unique teaching style. Under NCLB, the curriculum has to be narrowed down because the target of each teacher is to help students pass the state test. Meanwhile, each teacher under NCLB faces a risk of low salaries because NCLB requires that teachers' salary is tied to students' performance.