A. Print this page.
B. Write in the commas only where they are needed in the following sentences.
C. Check your work.

Remember:  Commas are needed before conjunctions only when the conjunctions join two complete thoughts that could stand alone as sentences.  If the sentence only expresses one complete thought, no comma is needed.  Because is NOT a conjunction.

1.  Nancy and Sharon sit at the back of the room and talk but they don't bother anyone.

2.  Conjunctions combine phrases and clauses and they also join words.

3.  Sharon and Neil may go for a bike ride or they may go bird watching.

4.  Dr. Gibbons did not have time to score the assignments so he cancelled them.

5.  Mrs. Blake just had a baby so she is tired but Mr. Blake is tired too.

6.  I studied the notes for two hours but I'm afraid I won't pass the test.

7.  "I'm sorry to tell you this but you have to give up junk food or soda pop," said the doctor.

8.  Mark gave a popcorn-flavored sucker to Jim because Jim forgot his lunch.

9.  I have a friend who works at the amusement park and she can get me a free pass.

10. Conjunctions and commas are often used together but you must know the rules for doing so.

Check your work.