A comma is used before "and" if it is a compound sentence. You can check to see if it is compound sentence by covering up the "and" and seeing if both parts of the sentence make sence by themselves. No comma is needed if the sentence is not compound. For Example: Bob ran, and he walked. (comma b/c it's compound) Bob ran and walked. (no comma b/c it's not compound) Hope this helps!
before
No, a comma is not necessary.
You would use a comma before it. Xerox, Inc.
no
if the main or most important part is before the main parts you use a comma, but if it is after then no comma
Yes, you can put a comma before except. Example of a comma before except in a sentence- She can do it, except that the mountain is too steep
You do not use a comma before III, or before any Roman Numeral, if it is part of a name such as King George III.
no
No
no
I do not use a comma before and after that word, therefore you will not see it in any sentence I have written.
Use a comma before a parenthesis when the information within the parentheses is not necessary for the sentence to make sense. Use a comma after a parenthesis when the information inside the parentheses is necessary for the sentence to be understood.