Streszczenie
English is commonly referred to as a “universal” language. Many people decide to study the language for a variety of reasons – to learn about a culture, to have a method of intercultural communication, to find a job, etc. In Poland specifically, students learn grammar and the theory of learning a language over the actual practice. As a result, common grammar mistakes occur throughout their learning process. This paper presents a list of these common grammar mistakes that English learners make. It also includes tips on how to improve one’s grammar and what to pay attention to.