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"A comma is used before and, or, or etc. in a list when its omission might either give rise to ambiguity or cause the last word or phrase to be construed with a preposition in the preceding phrase. … Generally, however, a comma is not used before and, or or etc. in a list."
War and campaign: This can occur when a "sub-war" is fought as part of a larger war (for example, the French and Indian War, as part of the Seven Years' War). A subsidiary conflict is typically a "sub-war" when it includes some participants not involved in the larger conflict; the article can then be categorized as a war involving those ...
Some people use the Oxford comma (also known as the Harvard or serial comma). This is a comma before "and" or "or" at the end of a series, regardless of whether it is needed for clarification purposes. For example: X, Y, and Z (with an Oxford comma) X, Y and Z (without an Oxford comma)
The comma-free approach is often used with partial quotations: The report observed "a 45% reduction in transmission rate". A comma is required when it would be present in the same construction if none of the material were a quotation: In Margaret Mead's view, "we must recognize the whole gamut of human potentialities" to enrich our culture.
The serial comma (for example the comma before and in "ham, chips, and eggs") is optional; be sensitive to possible ambiguity arising from thoughtless use or thoughtless avoidance, and be consistent within a given article. Avoid comma splices. Picture captions should not end in a full stop (a period) unless they are complete sentences.
Several reasons, actually. If someone has added or removed a comma in an article on your watchlist, do not simply reflexively revert the change, or edit war over it. Many commas are grammatically required, and many that aren't are stylistically preferred in formal writing. Furthermore, some low-register uses of commas are incorrect. Insertion ...
Place a full stop (a period) or a comma before a closing quotation mark if it belongs as part of the quoted material; otherwise put it after: The word carefree means "happy". But: She said, "I'm feeling carefree. " (Please do so irrespective of any rules associated with the variety of English in use.) read more ...
One comma between the day and year, and one comma after the year (unless some other puncutation follows the year). See Chicago Manual of Style, Section 6.46: "In the month-day-year style of dates, the style most commonly used in the United States and hence now recommended by Chicago, commas are used both before and after the year.