It can come before, or after, or before AND after, depending on where the writer wants the pause(s) to come, maybe! Sometimes a comma might not even be used at all with 'maybe'.
e.g.
* It could take a week, or maybe a bit longer, for us to write a reply to you. * Or, alternatively, maybe you could call into our office and we could discuss the matter. * Or maybe, and this is another option, you could telephone us and we might be able to give you an answer over the phone. * Or, maybe, by the time you have considered all the options, you might decide that it is not such a big issue after all!
No
A period should come before the footnote at the end of a sentence, while a comma should not.
Yes
A comma typically comes before "because" when it is used to introduce a dependent clause in a sentence.
If a comma is needed, it normally comes after parenthesis.
The comma would come after it.
No, a comma before "as appropriate" is not necessary. It depends on the context of the sentence and whether it flows better with or without the comma.
,I don't know maybe in the middle of a sentence
no . Additional: 'Which' sometimes has a comma before it, but it depends on the sentence. I find it hard to imagine a situation when 'which' would have a comma after it.
Return to sender does not require quotation marks or a comma.
No, a comma does not always come before "for instance." It depends on the structure of the sentence. A comma is typically used before "for instance" when it introduces a non-essential or parenthetical element in the sentence.
It is usually appropriate to place a comma before "but." One should not use a comma after "but."