In general, you do not need to place a comma before an "and" symbol when it is used to connect two items in a list or a series. However, if you are using the "and" as part of a more complex structure where clarity is needed, you might choose to use a comma for better readability. Always consider the context and the specific style guide you are following.
Do not put a space before a comma. Put one space afterthe comma.
No, you don't have to put a comma before at all.
Yes
no
Place the comma after the month and the day: August 15, 2012
Do not put a space before a comma. Put one space afterthe comma.
The comma goes after.
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.
You ussualy put a comma before the conjuction. On rare evernts you put the comma after.
before
No, you don't have to put a comma before at all.
no
no
Yes, you should put a comma before "as" when it is used as a conjunction in a sentence.
no
No.
The best guide is to put a comma when there is a short gap between the words when spoken.