下面哪些情况是剽窃（Y）？哪些不是剽窃（N）？ 1. I take ideas, materials and pictures from the Internet without referencing. 2. I use another person’s sentences but change them significantly without referencing. 3. I follow another person’s example in terms of design and method without referencing. 4. I take a graph from a textbook, giving the source. 5. I give a citation for some information but misspelling the author’s name.