Question

a comma should not be used to

Answer 1

1. Do not use a comma to separate compound items joined by and.
2. Do not use a comma between a verb and its complement.
3. Do not use a comma between the subject and verb, except when two commas are necessary to mark nonrestrictive sentence elements.
4. Do not use a comma before prepositional phrases, subordinate conjunctions, or other modifiers--unless they are necessary for clarification.
Hope that helped! Let me know if you need examples!!