Only in cases such as: The snake is blue, green, and yellow.
No.
Yes, you should put a comma before "as" when it is used as a conjunction in a sentence.
No.
You should put a comma before a person name if you're talking directly to them. ex- Please come here,Lily.
Yes, when naming a state in a sentence, a comma should be placed after the city and before the state. For example: "I live in Chicago, Illinois."
The comma goes after.
Do not put a space before a comma. Put one space afterthe comma.
no. if but before is a sentence on its on and after but is a sentence on its own then put a comma before but.
before
You ussualy put a comma before the conjuction. On rare evernts you put the comma after.
No, you don't have to put a comma before at all.
no