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When I was studying for my CELPIP exam I got material from them. Unfortunately, I can not put the PDF to the public because it has a watermark with my personal email. But I can put you here what it says.

CELPIP's seventeenth error as they state:

The comma is the most frequently used punctuation symbol in English. As a result, it is often responsible for the most errors. Since there is a dozen of instances where commas can be used, the rules for comma use are extensive. The most common are presented here. We suggest that you review Unit 2: Run-On Sentences since it also covers comma use.

How to Use the Comma

You will use the comma in the following cases:

  • To separate independent clauses joined by coordinating conjunctions such as or, and, but, and for in compound sentences.
    Miguel will be busy at that time, but you can call me instead.
  • To separate words, phrases, and clauses in a series of three or more. The comma before and in a series is optional.
    You said: one, two and three.
  • To separate introductory words or phrases from the main clause.
    Since 1949, I have not been that surprised as I am today.
  • To separate extra information that the reader does not need to understand the main clause.
    Miguel, who is a successful business dog, likes to take a walk every day.
  • After a salutation in a friendly letter.
    Thank you,
    Miguel

Beware

Commas should not be used to separate compound predicates.

  • Mike barked goodbye to us, and went to sleep.
  • Mike barked goodbye to us and went to sleep.

Good luck!

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