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https://www.grammarbook.com/punctuation/commas.asp

Commas | Comma Rules and Usage
https://www.grammarbook.com/punctuation/commas.asp
The comma has several uses in English grammar, all related to marking-off separate elements within a sentence. Commas and periods are the most frequently used punctuation marks.

https://www.grammarly.com/blog/comma/

Comma Rules: A Quick Guide | Grammarly
https://www.grammarly.com/blog/comma/
Ah, the comma. Of all the punctuation marks in English, this one is perhaps the most abused and Some writers think of a comma as a soft pause—a punctuation mark that separates words, clauses…

https://en.wikipedia.org/wiki/Comma

Comma – Wikipedia
https://en.wikipedia.org/wiki/Comma
The comma , is a punctuation mark that appears in several variants in different languages. It has the same shape as an apostrophe or single closing quotation mark (‘) in many typefaces…

https://www.thepunctuationguide.com/comma.html

Comma | The Punctuation Guide
https://www.thepunctuationguide.com/comma.html
The comma might be the most troublesome punctuation mark. The presence or absence of a comma can change the meaning of a sentence⁠—sometimes dramatically.

https://www.really-learn-english.com/comma-punctuation.html

Comma Punctuation – Rules and Examples
https://www.really-learn-english.com/comma-punctuation.html
Comma Punctuation is one of the most common punctuation marks in English. In this lesson, we are going to learn the rules of comma punctuation ( , ) in the English language.

https://www.thoughtco.com/what-is-comma-punctuation-1689871

The Comma in Punctuation
https://www.thoughtco.com/what-is-comma-punctuation-1689871
The comma is a punctuation mark used to indicate a separation of ideas or elements within a sentence. The Comma in Punctuation. Share. Flipboard. Email.

https://owl.purdue.edu/owl/general_writing/punctuation/commas/index.html

Commas: Quick Rules // Purdue Writing Lab
https://owl.purdue.edu/owl/general_writing/punctuation/commas/index.html
The comma is a valuable, useful punctuation device because it separates the structural elements of sentences into manageable segments. The rules provided here are those found in traditional…

https://en-academic.com/dic.nsf/enwiki/37426

Comma (punctuation)
https://en-academic.com/dic.nsf/enwiki/37426
A comma ( , ) is a punctuation mark. It has the same shape as an apostrophe or single closing quotation mark in many typefaces, but it differs from them in being placed on the baseline of the text.

https://englishsentences.com/commas/

Commas: Examples and Definition
https://englishsentences.com/commas/
Examples and definition of a Commas. A comma (,) is a punctuation mark that is frequently used in sentences. Commas separate ideas, add pauses, and help you to list things clearly.

https://wordvice.com/when-to-use-commas-colons-semicolons-and-dashes/

When to Use Commas, Colons, Semicolons, and Dashes | Wordvice
https://wordvice.com/when-to-use-commas-colons-semicolons-and-dashes/
Which Punctuation Mark Should I Use? Knowing which punctuation to apply within sentences can be confusing. But rules are important and made to be followed, especially in academic writing.