Answered By: Writing Center
Last Updated: Nov 16, 2015     Views: 4

It is appropriate to use commas in the following conditions:
1) Use commas after introductory phrases of more than three or four words to make sentences clear and easy to read;
2) Use commas after introductory subordinate clauses, such as if, when, because, before, unless;
3) Use commas between incidental or contrasting sentence elements or clauses;
4) Use commas after conjunctive adverbs at the beginning of sentences or clauses;
5) Use commas to set off absolute phrases;
6) Use commas to mark contrasts or transitions;
7) Use commas to separate words where verbs or predicates have been deleted to avoid repetition;
8) Use commas to keep ideas clear and distinct;
9) Use commas to separate conversational expressions from the main body of a sentence.

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