This is the most blatant form of plagiarism. Unfortunately, the reader who finds the error, not knowing the writer's intent, can only assume the plagiarism is intentional. Intentional or not, plagiarism in any paper will still carry serious penalties. Proper paraphrasing does not mean changing a few words here and there, nor does it mean omitting a few sentences or scrambling their order. For a more complete explanation of proper paraphrasing, see your textbook.
Many students overreact when they learn what plagiarism means.
Both reactions are in error, for good writing involves the synthesis of your own ideas with the ideas of others. Documentation serves the purpose of clearly indicating which ideas are yours and which are those of other writers. If you are in doubt about that dividing line, ask your instructor or the writing Center tutors for guidance. Plagiarism, because it is a form of theft, burglary, kidnapping, or dishonesty that interferes with the goals of education, may carry severe penalties. Your instructor may have other penalties in the course syllabus and may choose to initial disciplinary proceedings against any student guilty of plagiarism.