Usually an ellipsis is used ( . . . ) ; see related link .
If you mean "do we use a comma before 'etc.'?", then yes we do. Remember to take some paper, a pen, etc. (Oxford ALD).
Yes, you should use a comma before "etc." when it is used at the end of a list to indicate that there are other items that could be included. For example, "I bought apples, bananas, oranges, etc., at the grocery store."
Capitalize after a comma when it occurs within a sentence if it is the beginning of a new sentence or a proper noun. For example: "John went shopping. He bought a new shirt." or "I visited Paris, France, last summer."
Sequence F(n): -3/2,5/4,-7/6,9/8,-11/10,etc F(n) = (-1)n(2n+1)/(2n)
Twice, with a comma before and between, like this: The frumpy lecturer went boringly on and on ad infinitum and even beyond, etc, etc.
The comma goes after the word 'because' when it is used at the beginning of a dependent clause, separating the clause from the main clause. For example: "I stayed inside, because it was raining."
Yes, a comma should be used after "which" when it introduces a nonrestrictive clause in a sentence.
No. After the word and comma can not be used, as it is grammatically inappropriate to use comma after conjunctions such as and, which are called coordinate conjunctions.
No.
Yes, you should use a comma before "Jr." when writing a person's name to separate the person's last name from the suffix. For example, "John Smith, Jr."
No, a comma is not necessary.
no