AP® English Language and Composition · Big Idea 4 Style: Syntax and Sentence Structure (Skills 7.B, 8.B)
7.B Choosing Between Coordination and Subordination (STL-1.I)
Joining two facts with and, but, or because isn't a style choice for smoother sound. Each option makes a different claim about how the facts relate, and subordination ranks one fact beneath the other.
Coordination joins two independent clauses as equals: he apologized and he resigned reports two acts of the same standing, side by side, no fact outranking the other. Subordination demotes one clause so it can't stand alone, turning it into a condition, cause, time marker, or contrast for the main clause: after he apologized, he resigned keeps the resignation as the main event and shrinks the apology into a timestamp. Same two facts, different argument about what mattered.
The decision isn't grammatical housekeeping. You look at the two facts, ask which one you want the reader to walk away remembering as the point, and put that one in the main clause. The other fact gets subordinated with a connector that names the relationship you intend: because for cause, although for concession, when for timing, if for condition. The report was 3 days late, and the deadline moved by 2 weeks sits the facts side by side and lets the reader guess at a link. Because the report was 3 days late, the deadline moved by 2 weeks commits to causation. Nothing in the raw facts forced that claim; the subordinator did.
This sits right behind the sentence shapes that follow it. Periodic sentences delay the main clause, piling up subordinate material first so the claim lands at the end. Cumulative sentences front the main clause and let subordinate details trail off after. Both shapes depend on already knowing which clause is doing the main work and which ones are leaning on it. Coordination and subordination is the decision that makes those architectures possible.
Key terms
- Coordination
- Joining two independent clauses with a word like and, but, or or so that both keep equal grammatical standing.
- Subordination
- Attaching a clause to a main clause with a word like because or although so it can no longer stand alone.
- Independent clause
- A clause with a subject and verb that expresses a complete thought and can stand as its own sentence.
- Subordinating conjunction
- A connector such as because, although, after, or if that demotes a clause and names its relation to the main clause.
- Main clause
- The independent clause in a sentence that carries the claim the writer wants emphasized.
Watch it explained
- How it worksHow do you decide which of two facts belongs in the main clause and which one gets demoted?
- Worked exampleShow me four ways to join the report was late and the deadline moved, each claiming something different.
- Common mistakeWhy isn't combining two short sentences just a way to stop the prose from sounding choppy?
Check yourself
End of topic.