Question

A comma should not be used to __________.

-separate compound elements
-set apart an introductory phrase
-separate narration from quotations
-set apart introductory words or interjections

Answer 1

The answer would be 'separate compound elements' (ex: noun + noun, noun + verb, etc.). You do not need a comma to separate these words.

Answer 2

separate compound elements

Compound elements are supposed to go together; that's why they are called compound. Sometimes hyphens are used to show how together compound elements are. They should not be separated with a comma. Examples of why the other three options are: In the other room, I can hear the children. He said, "I love waffles." Tomorrow, I will mow the lawn. Yes, I can go to the store.