Often you need to use sources in foreign languages in your paper. For non-Latin scripts such as Chinese and Japanese, the reference needs to be transliterated into English alphabets.
Copying something word for word but not using quote marks (even if you cite it, it's still plagiarism)
Using significant ideas and concepts from someone else without a citation-even if you put them into your own words (called paraphrasing), you need to give credit
Paraphrasing too closely by making only small changes to a passage, still retaining the same structure and words as the original (even if you cite it!)