When to Use a Comma:
* Before "etc." as part of a list: If "etc." is used to indicate that the list continues, you should use a comma before it.
*Example: "We need to buy milk, eggs, bread, etc. for the party."
* Before "etc." when it's the last item in a series: If "etc." is the final item in a list, a comma should be used before it.
*Example: "The students were studying math, science, history, etc."
When NOT to Use a Comma:
* Before "etc." if it's part of a phrase: If "etc." is integrated into a phrase, a comma is not necessary.
*Example: "The results were mixed, with some students excelling and others struggling, etc."
* Before "etc." at the end of a sentence: A comma is not necessary before "etc." at the end of a sentence.
*Example: "They discussed various topics, such as politics, economics, and culture, etc."
In Summary:
Use a comma before "etc." when it's part of a list or if it's the last item in a series. Otherwise, a comma is not necessary.