There is an onus on every student to become informed as to what does or does not constitute plagiarism. Ignorance of applicable standards of ethical writing is not an acceptable excuse. The critical consideration is the impression created in the mind of the others, not the subjective intent of the student. This determination involves an objective evaluation of the manuscript. No intent to deceive is required to establish plagiarism.
Adequate attribution is required.
What is essential is that another person has no doubt which words or research results are the student's and which are drawn from other sources. Full explicit acknowledgement of the source of the material is required. The use of material received or purchased from another person or prepared by any person other than the individual claiming to be the author. The verbatim use of oral or written material without adequate attribution. The paraphrasing of oral or written material of other persons without adequate attribution.