It is usually not necessary.
Before EX: I need eggs, and butter.
No, you don't have to put a comma before at all.
Do not put a space before a comma. Put one space afterthe comma.
No, I believe that the comma is before the 'or', or I may be mistaken.
It depends. Here are examples: In this sentence, a comma is only necessary after the "for example": For example, yesterday she fell down and didn't even cry. In this sentence, a comma is necessary before and after "for example": You, for example, would also be depressed if you were failing trigonometry.
No. There is no word in English that always requires a comma before it.
Typically, there is no need for a comma before the word "as." However, using one is not technically wrong, just superfluous.
A comma typically goes before "so" when it is used at the beginning of a sentence to indicate a reason or result. However, when "so" is used as a conjunction in the middle of a sentence, it does not usually need a comma before it.
Before EX: I need eggs, and butter.
not in all cases.
you don't need comma
The general rule is that it doesn't need a comma before it. Example: I like apples as well as guavas.
A comma is typically used before "but" when it connects two independent clauses. However, if "but" is joining phrases within a single sentence, a comma is not necessary.
yes
When which is used to introduce a nonrestrictive adjectivial clause it must it must follow a comma. But there are numerous examples where which does not need to follow a comma. Including: Which melon do you want? I can't tell which melon to buy.
Before. Example: I would have punctuated correctly, but the friendly folks on answers.com were misinformed.
Yes.