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The difference between an Oxford comma and a regular comma is that an Oxford comma refers to the final comma in a series that would come before the last conjunction of a sentence. In contrast, a ...
"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."
A comma between clauses may change the connotation, reducing or eliminating ambiguity. In the following examples, the thing in the first sentence that is very relaxing is the cool day, whereas in the second sentence it is the walk, since the introduction of commas makes "on a cool day" parenthetical:
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)
As in the second of the two examples below, if a semicolon separates the two sentences and the second sentence starts with an adverb, this adverb is preceded by a semicolon and followed by a comma. In this sentence, furthermore, commas would also be called for. This sentence is a bit different; however, a comma is necessary as well.
Before a conjunctive adverb that joins two independent clauses, the following comma is incorrect: The ultraviolet (UV) index is high, therefore use sunscreen. Around a conjunctive adverb that joins two independent clauses, the following semicolon and comma are correct: The weather is perfect now; however, a seabreeze can whip up a storm.