It can actually be either way. But you would have to re-word it. Ex:
Dahlia was packing, while I cooked dinner.
Dahlia was packing while I cooked everyone dinner.
,Always.
Sometimes but if one uses a comma in a question here it gets automatically removed. Yes, while I am answering this question, you will be reading the answer. This is an example sentence.
before
No, a comma is not necessary.
no
You would use a comma before it. Xerox, Inc.
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
no
No
no
No, typically a comma is not used before "III" when it follows a name or title.