Commas
Commas are used to connect complete sentences, but only
if a coordinating conjunction joins them. Coordinating
conjunctions are the shorter joining words; some people
find it easy to remember which these are through the
mnemonic (memory trick) FANBOYS: For, And, Nor,
But, Or, Yet, So.

The old house should be condemned, for it’s about
to crumble.
Angela bakes fabulous bread,
yet she can’t make
biscuits.
Our hosts began to argue,
so we decided to leave.
That joke was not funny,
nor was it in good taste.

Notice the construction of the last example sentence; when
the conjunction ‘nor’ is used, the subject and verb are
inverted, as in a question.        

Commas are also used to set a
non-restrictive clause apart
from the rest of a sentence. A non-restrictive clause adds
extra, non-essential, information; the sentence would have
the same meaning if the clause were deleted.

Elmer’s paisley suit, which he’s had for many years,
has come back into style.
She writes grants, an on-going effort, for our local
pre-school.

Note that two commas, one before and one after, are used
with non-restrictive clauses.

Finally, a comma is used after an introductory word or
phrase. One example is the preceding sentence; the word
finally introduces the sentence, so a comma comes after it.
Here's another example:

After an introductory word or phrase, you need to
place a comma.

However if the introductory phrase is moved to the end of
the sentence, no comma is used.

You need to place a comma after an introductory
word or phrase.
   
#1 Fanboy: FOR
#2 Fanboy: AND
#3 Fanboy: NOR
#4 Fanboy: BUT
#5 Fanboy: OR
#6 Fanboy: YET
Practice quizzes on
commas from Capital
Community College:
with
Coordinating
Conjunctions
with Introductory
Elements
General - Fill-ins
General - Revision
#7 Fanboy: SO
Free Praxis Prep is a service of Multicultural Education Programs at the University of Southern Maine
About Us   Using this Material   Contact Us   Linking