After I have read the ten questions, I started understanding the meaning of plagiarism from different sides. There were two questions which took my attention somehow. The first one question is number 2 and the other one is number 4. I would say those might be the most difficult question that I didn't be able to answer them.

The number 2 question talked about the common knowledge which uses by many people. Sometimes you have to write a research paper and you are a new student who always his background comes from textbook. You are not very sure if you should cite common knowledge or not. Some people think that common knowledge can be shared by anyone without a citation. But, other people disagree with them because they say that common knowledge still belongs to someone who wants his ideas to be citied. Personally I believe that depends on the situation; for example, if you want to be more clearly with your professor and you have to show him that you are working hard by finding the sources and citing them. Therefore, the answer of the Web site was that you need to cite the information from the textbook you read.

The last question is number 4 is more difficult than the first one. This question mentioned that for instance there is a group of students and they discuss some ideas which related to same homework. If one member of the group said an interesting idea would you take it and write it down. This question has two differences opinions. One side believes that the purpose of the group is to share ideas and students don't need to cite them. On the other hand, others consider that as a plagiarism because it belongs to that person and students can cite it as "Personal communication". Actually, I agree with the last group who think that if you take an idea from others, you need to cite it.