Paraphrase should be the default, and quote the exception. An essay should be written in the author's own words, and not be a "patchwork" of quotations. Quote when:
- the author's choice of words is particularly striking
- it is a famous citation from an authority
- you disagree with the author, and, to be fair, want to quote them exactly.
Quoting means citing a resource verbatim, that is to say, without making any changes. Any changes must be indicated in square brackets. Students should be careful not to change the meaning of the text or misrepresent the author's ideas.
Paraphrasing means restating the content of a passage in your own words: you are supposed to change the structure of the sentence, and use different words from the original passage where possible. Here is two videos (one very short, one longer) with examples.
University of Guelph McLaughlin Library, CC BY-NC-SA
University of Maryland, Baltimore Writing Center
Some recommendations for a paraphrase:
Be careful not to change the meaning of the passage. Of course, you must always add the source at the end of your paraphrase.
Summarising means restating the passage in your own words, by making it very short, keeping only the main points.