Use a comma before these joining words when you are constructing a compound sentence. (Hint: Remember the word formed downward by the first letters of each joining word.)
d

+
In the examples following, underlined spaces indicate that a comma is needed.
I want to go, but you want to stay.
He died before she was born _ so she never knew him.
Put a comma between items in a series.
2.
Wasp
3.
The sting of a bee
or hornet can cause a severe reaction.
Soon the students will retum , the halls will be buzzing , and the studying
will begin
A comma goes after an introductory expression or before an expression that follows the sentence
but is somewhat separated from the rest of the sentence (doesn't flow easily into the sentence).
Well, I haven't seen anyone yet.
b when the time comes , we will be ready.
It's tiring to go to school all day , isn't it?
Put commas around the name of a person spoken to or addressed.
Rick , bring that into the classro
b I know, Jan, that you are missing your family.
Put commas around an expression that interrupts the flow of the sentence.
The facts, therefore, do not support your argument.
sroom
5.