The following examples could be considered plagiarism:
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Copying from a textbook - This is plagiarism if proper citation is not provided.
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Copying an idea but changing the tense - This is still considered plagiarism, as the idea is not original.
The other examples listed would generally not be considered plagiarism if done correctly:
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Quoting a writer’s idea and including the source - This is proper citation and not plagiarism.
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Paraphrasing a text - This is not plagiarism as long as it is properly done and cited.
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Paraphrasing an idea, and including an in-text citation and the source in the reference list - This is proper academic practice and not plagiarism.
Always ensure that appropriate citations are provided when using someone else's work or ideas.