This document is a workshop from Purdue University's Writing Lab about proper comma usage. It discusses what commas are and their grammatical purpose, as well as rules for using commas with clauses, phrases, compound and complex sentences, lists, adjectives, and correcting comma splices. The workshop provides examples and exercises for determining correct comma placement and identifies additional resources for comma help.
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1. Conquering
the Comma
A workshop brought to you by
the Purdue University
Writing Lab
Purdue University Writing Lab
2. What Is a Comma?
A comma is a punctuation
mark that indicates a
pause is needed in a
sentence.
Grammatically, commas
are the sheepdogs.
They separate elements.
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3. What Is a Comma?
A comma is a punctuation
mark that indicates a
pause is needed in a
sentence.
Grammatically, commas
are the sheepdogs.
They separate elements.
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4. Clauses and Phrases
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A clause is a group of
words that contains both
a subject and a verb that
complement each other.
A phrase is a group of
words that does not
contain a subject or a
verb that complement
each other.
5. Sentence Structure:
Independent Clause
A complete sentence has two
components, a subject and a
verb.
The subject and verb must
form a complete thought to
be considered an
independent clause.
TThhee ccoouuppllee ddaanncceess..
subject (S) verb (V)
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6. Sentence Structure:
Compound Sentence
A sentence that contains two
independent clauses joined
by a coordinating conjunction
is called a compound
sentence.
A conjunction joins words,
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phrases, and clauses
together in a sentence.
Conjunctions
for
and
nor
but
or
yet
so
FAN BOYS
7. Sentence Structure:
Compound Sentence
The comma in a compound
sentence is placed before the
coordinating conjunction.
S V conj.
Andy built a snowman, and
Jeff played with his dog.
S V
Andy built a snowman, and
Jeff played with his dog.
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8. Sentence Structure:
Compound Sentence
Where would you
place the comma in
the following
sentence?
DDaann ssttrruugggglleedd wwiitthh hhiiss hhoommeewwoorrkk, ssoo hhiiss ffaatthheerr hheellppeedd hhiimm..
S V conj. S V
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9. Sentence Structure:
Dependent Clause
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A dependent
clause contains a
subject and verb,
but the clause
cannot stand
independently.
Dependent clauses
can often be
identified by the
use of dependent
clause markers.
Some dependent clause markers:
because
since
when
while
until
if
as
though
although
unless
after
before
once
whether
10. Sentence Structure:
Dependent Phrases and Clauses
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Dependent phrases
and clauses help to
clarify and add detail
to an independent
clause.
Dependent clauses
may appear at the
beginning, middle, or
end of a sentence.
11. Introductory clause=
dependent clause located at the beginning
of a sentence
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When a dependent
clause is placed at the
beginning of a sentence,
place a comma between
the independent clause
and the dependent
clause.
WWhheenn EElliizzaabbeetthh ccaalllleedd 991111,, tthhee ffiirreemmeenn rruusshheedd ttoo hheerr rreessccuuee..
DCM S V S V
12. Introductory Clause
Where would you place the comma in the
following examples?
Since it was raining, we decided to go to the movies.
DCM S V S V
Since it was raining we decided to go to the movies.
Once the movie began, I fell asleep.
DCM S V S V
Once the movie began I fell asleep.
After After the the movie movie ended, ended we we went went out out for for coffee.
coffee.
DCM S V S V
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13. Dependent Clauses
When a dependent clause is
located after an independent clause,
DO NOT place a comma between the two.
I went on the roller coaster because my brother dared me.
S V DCM S V
I became very sick when the
S V DCM
roller coaster zoomed upside down.
S V
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14. Sentence Structure:
Essential Phrases and Clauses
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An essential clause or
phrase is used to modify a
noun.
It also adds information
that is critical to the
meaning of the sentence.
Essential clauses are NOT
set off by commas.
15. Sentence Structure:
Essential Phrases and Clauses
The people who work in my office are so uptight!
S essential phrase V
Without the essential phrase, this sentence does not
make complete sense : The people are so uptight!
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16. Sentence Structure:
Essential Phrases and Clauses
The martini that I had at Joe’s was much better than this one!
S essential V
The word “that” is almost always an indicator of
an essential phrase or clause.
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17. Sentence Structure: Nonessential
Phrases and Clauses
A nonessential phrase or clause adds
extra information to a sentence.
This information can be eliminated from
the sentence without jeopardizing the
meaning of the sentence.
Always place commas around
nonessential phrases and clauses.
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18. Sentence Structure: Nonessential
Phrases and Clauses
My brother, who lives across town, plans to throw a party!
S non-essential V
Even without the phrase the sentence still makes
sense : My brother plans to throw a party!
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19. Sentence Structure: Nonessential
Phrases and Clauses
Steve said that he would propose to me on
Valentine’s Day, which is my favorite holiday!
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S V
non-essential
Use commas to set off additional information
20. Would you place commas in the
following sentences? If so, where?
I am planning a trip to Paris
Paris,
which is one of the greatest
cities in the world.
The place that I would most
like to see is the Eiffel Tower.
No comma is needed. The sentence is correct.
Pierre, who is one of my
business contacts, will meet
me at the airport.
Pierre who is one of my
business contacts will meet
me at the airport.
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21. Sentence Structure:
Commas in a Series
Place commas in a sentence to
divide items in a list.
The commas will help the reader to
avoid confusion.
The comma before the conjunction
is generally required, but it can be
omitted if there is no possibility of
confusion.
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22. Sentence Structure:
Commas in a Series
Consider the difference in the following:
Last month, Alex dated Mary Ann Lee
and Kim.
Last month, Alex dated Mary, Ann, Lee,
and Kim.
Last month, Alex dated Mary Ann, Lee,
and Kim.
How many women did Alex date?
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23. Sentence Structure:
Commas in a Series
Commas should be placed in series of words,
phrases, or clauses.
Place commas in the following sentences:
Martina brushed her hair, hair put put on
on
pajamas, and went to bed.
her pajamas and went to bed.
She She fell fell asleep asleep and and dreamed dreamed that that she she was
was
a princess princess, she she kissed kissed a a frog frog, and and she
she
rescued her prince.
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24. Commas with adjectives
Use commas to separate adjectives that
provide an equal description of a noun.
THE TEST:
Can you put “and” between the adjectives?
Can they be described in reverse order?
If so, use a comma.
big blue house three hungry kittens
a cranky, ungrateful man
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25. A Common Comma Error:
The Comma Splice
A comma splice is an error in which two
independent clauses are joined by a comma.
We had a nice time, I hope we can meet again soon.
S V S V
The Internet has revolutionized the business world,
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S V
online sales have increased dramatically this year.
S V
26. To Correct a Comma Splice
Insert a conjunction between the two independent
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clauses.
Start a new sentence.
Insert a semi-colon between the two independent
clauses (only in cases where the independent clauses
are closely related in topic).
•We had a nice time, and I hope we can meet again soon.
•We had a nice time. I hope we can meet again soon.
•The Internet has revolutionized the business world; online
sales have increased dramatically this year.
27. How would you correct the
following sentences?
This semester I am taking calculus physics and economics.
This semester I am taking calculus, physics, and economics.
Calculus is my best subject, I am certain I will get an A.
Calculus is my best subject, and I am certain I will get an A.
Although I am very busy I still find time to have fun.
busy, I still find time to have fun.
Last weekend my brother visited me me, and and we we went went to to a a
football
football game a party game, and a party, a rock and concert.
a rock concert.
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28. Where can you go for additional help
with comma usage?
Purdue University Writing
Lab
Heavilon 226
Grammar Hotline:
(765) 494-3723
Check our web site:
http://owl.english.purdue.edu
Email brief questions:
owl@owl.english.purdue.edu
Purdue University Writing Lab