Understand the difference between coordination and subordination.

A coordinating conjunction can join two main clauses that a writer wants to emphasize equally. The pattern for coordination looks like this:

main Clause + , + coordinating conjunction + main Clause.

Subordination, however, emphasizes the idea in the main clause more than the one in the subordinate clause. Generally, the patterns look like these:

main clause + Ø + subordinate clause.

subordinate Clause + , + main Clause.

Read the pairs of sentences that follow. The first version coordinates the two ideas. The second version subordinates one idea to emphasize the other.

To survive the fetal pig dissection, Rinalda agreed to make all of the incisions, and Frances promised to remove and label the organs.

To survive the fetal pig dissection, Rinalda agreed to make all of the incisions if Frances would promise to remove and label the organs.

Diana stared dreamily at the handsome Mr. McKenzie, but Olivia, who hated economics, furiously jiggled her foot, impatient to escape the boring class.

While Diana was staring dreamily at the handsome Mr. McKenzie, Olivia furiously jiggled her foot, impatient to escape the boring economics class that she hated.

At a red light, Maria jumped out of Gino's car and slammed the door, for she could not tolerate one more minute of the heavy metal music that Gino insisted on blasting from the stereo.

At a red light, Maria jumped out of Gino's car and slammed the door because she could not tolerate one more minute of the heavy metal music that Gino insisted on blasting from the stereo.

Making an A in Anatomy and Physiology has not helped Sima choose a career. She might decide to make her parents happy and go to medical school, or she might use her knowledge of the human body to become a sculptor.

Making an A in Anatomy and Physiology has not helped Sima choose a career. Although she might decide to make her parents happy and go to medical school, she might also use her knowledge of the human body to become a sculptor.

Kyle refused to eat the salad served with the meal, nor would he touch any green vegetable put on his plate.

After Kyle refused the salad served with the meal, he then would not touch the green vegetables put on his plate.

Joe spent seven hours studying calculus at the Mexican diner, so now he can set his math book on fire with his salsa breath.

Since Joe spent seven hours studying calculus at Taco Bell, he can now set his math book on fire with his salsa breath.

Because she gets seasick, Danielle is dreading the spring break cruise, yet she might enjoy herself once she realizes how many cute guys in skimpy bathing suits parade the decks.

Even though Danielle is dreading getting seasick on the spring break cruise, she will probably enjoy herself once she realizes how many cute guys in skimpy bathing suits parade the decks.