last comma before the and is not necessary
yes comma is needed after three or more words in a series.
No, don't use a comma after "and" in a series. There are two acceptable comma styles for series. One includes a comma before the final "and" (red, yellow, and blue). The other does not include the final comma (red, yellow and blue).
yes a comma follows after a name in a letter even on the computr and when your emailing someone.
A semicolon or a comma can follow the word "however" in a sentence.
A comma
In a series you should put commas after each element, except for the last. For example you should write: John, Margaret, Mary, and Paul came to the party. The comma after Mary is called the Oxford, Serial, or Harvard comma. Most style guides on both sides of the Atlantic recommend always using this comma.
no
In punctuation, the comma comes before the apostrophe when it follows a plural possessive. For example, "The dogs', wagging tails" is correct.
A colon is included in a ratio, like 4:2. A comma follows a ratio.
You can use ", and" or just "and" but not just a comma.
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