Writing is very important for learners; it is a dynamic and creative skill. The objectives of this study are to investigate the errors of students' writing and to discover the reasons behind these committed errors. This research is a qualitative case study. The researcher asked the participants to write a paragraph in 100-150 words about one of the following topics (Your Best Friend, A Nice Place to Visit, Your City, and Your Neighborhood). The paragraphs were collected from the 2nd semester 2017-2018 final exam. Then the researcher interviewed 10 students to discover the causes behind these errors. 60 English paragraphs were written by 60 (Male& Female) participants at Zarqa University. The participants are in the first year and studying English Language Literature. Their paragraphs were collected, then analyzed. . The results showed that students had committed different grammatical, spelling, pr