e.g., The sun rises in the east and sets in the west.
The thirteen colonies formed the United States of America.
The capital of West Virginia is Charleston.
Your Own Opinions & Ideas
...but be careful! If your ideas are based upon material you've reviewed, make sure to cite or attribute the work your opinion is based upon.
Plagiarism is defined as: "The action or practice of taking someone else's work, idea, etc., and passing it off as one's own; literary theft."
If you do not cite someone else's work -- even if it's just a few words or a short statement -- you have plagiarized.
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