Coordination and subordination are ways of joining ideas in sentences that show relationships between ideas and emphasize more important ideas. In speech, people tend to use and and so as all-purpose connectors.
I’m leaving now, and I’ll see you later.
The meaning of this sentence may be perfectly clear in speech, which provides clues with voice, facial expressions, and gestures. But in writing, the sentence could have multiple meanings, including these:
Although I’m leaving now, I’ll see you later.
I’m leaving now because I’ll see you later.
A coordinating conjunction such as and gives ideas equal emphasis, and a subordinating conjunction such as although or because emphasizes one idea more than another. Choosing appropriate conjunctions also allows a writer to specify how the ideas are related.
AT A GLANCE
How do your ideas flow from one sentence to another? Do they connect smoothly and clearly? Are the more important ideas given more emphasis than less important ones?