ACT English: Control Sentence Variety With Subordinate and Coordinate Clauses

Coordination joins two equal (independent) clauses with a coordinating conjunction (and, but, or, yet, so). Example: "She studied hard, and she passed the test." (Two equally important ideas.) Subordination joins a dependent clause to an independent clause, showing that one idea is less important. Example: "Because she studied hard, she passed the test." (The studying is the supporting reason; passing is the main idea.) Use coordination when two ideas are equally important or contrasting. Use subordination when one idea explains or depends on the other. The right choice depends on which idea is the main point and which is supporting.

Why it matters: Overusing coordination creates choppy, list-like writing. "She woke up, and she went to school, and she studied hard, and she passed." Subordination flows better: "Because she woke up on time and studied hard, she passed." The supporting details are grouped, and the main point stands out.

Mistake 1: Using coordination when subordination is clearer. "The storm was severe, but they still went outside." Here, "but" suggests the storm and going outside are equally balanced. Better: "Despite the severe storm, they went outside." (Subordination shows the severity as a barrier they overcame.) Mistake 2: Overloading a sentence with subordination. "Because she wanted to succeed, when she woke up early, while she studied hard, she passed the test." Too many because/when/while clauses confuse the reader. Better: "Because she wanted to succeed, she woke up early and studied hard, which helped her pass." (Mix coordination and subordination.) Always ask: What is the main idea? What are the supporting ideas? Use subordination to connect supporting ideas to the main one.

On the ACT, if you see a sentence with multiple coordinating conjunctions (and...and...and), check if subordination would be clearer. Many students miss these opportunities to improve flow.

Sentence 1 (Original): "He was tired, and he was hungry, and he was frustrated." (Choppy coordination.) Fix: "Because he was tired and hungry, he was frustrated." (Subordination and coordination mixed.) Sentence 2 (Original): "Although it was raining, and it was cold, they went for a walk." (Awkward mix.) Fix: "Although it was raining and cold, they went for a walk." (Cleaner coordination within the subordinate clause.) Sentence 3 (Original): "She learned new skills, and she became more confident, and she got the job." (Monotonous coordination.) Fix: "By learning new skills and becoming more confident, she got the job." (Subordination shows the cause-effect relationship.) For each sentence, identify the main idea and supporting ideas, then rewrite using the appropriate mix of subordination and coordination.

Read your revised sentences aloud. You will hear the improvement in flow and clarity. This sensory feedback trains your ear to prefer subordination for dependent ideas and coordination for equal ideas.

Sentence-combining and variety questions appear 1-2 times per test. The ACT rewards writers who show control over how ideas relate to each other by choosing the right logical connectors. Understanding subordination and coordination gives you the tools to show these relationships clearly and earn points on sentence-combining questions that other students find confusing.

This week, take a paragraph from your own writing and mark where you use coordination. For each coordinated clause, ask: Is this idea equally important, or is it supporting? If it is supporting, try subordination. Rewrite the paragraph with a mix of subordination and coordination. By test day, you will naturally choose the right connector and sentence structure, making your writing flow and your answers clear.