Students, parents, teachers, and visitors . . .
Students, parents, teachers and visitors . . .
Whether to put a comma between "teachers" and "and" depends upon your style manual. Go with what your book says.
Ok Ms.Sue. I checked all over, and i came across the Common Rules for it. It says to separate 2 or more adjectives preceding a noun with a comma.
Ok. Then you don't need a comma before "and."
Sometimes, when you omit that comma before the conjunction, you alter the meaning of the sentence.
You might be interested in an article about English grammar in the workplace:
This passage explains and illustrates why you should ALWAYS include that serial comma before the conjunction:
Tom Kamenick battled fellow attorneys at a Milwaukee, Wis., public-interest law firm over use of "the Oxford comma" — an additional comma placed before the "and" or "or" in a series of nouns [or phrases]. Leaving it out can change the meaning of a sentence, Mr. Kamenick says: The sentence, "The greatest influences in my life are my sisters, Oprah Winfrey and Madonna," means something different from the sentence, "The greatest influences in my life are my sisters, Oprah Winfrey, and Madonna," he says. (The first sentence implies the writer has two celebrity sisters; the second says the sisters and the stars are different individuals.)
And, Losa, keep in mind that what you wrote in your first post here is a sentence with a series of NOUNS, not adjectives:
"Students parents teachers ... visitors" = all nouns
Ok. I will Writeacher. Thank you Writeacher and Ms.Sue!