Purpose
By the end of this lesson, you will be able to construct compound sentences correctly, using coordinating conjunctions and correct comma placement.Lesson Explanation
A compound sentence joins two or more independent clauses (Part 2, Lesson 1) — each one grammatically complete on its own — into a single sentence. The most common way to join them is with a comma plus a coordinating conjunction, using one of the seven FANBOYS words introduced in Part 1, Lesson 5: “I wanted to go, but it was raining.” Both “I wanted to go” and “it was raining” are independent clauses that could stand alone. A genuinely important, frequently violated rule: the comma belongs BEFORE the coordinating conjunction, not after it, and is required specifically because two independent clauses are being joined — this comma is often skipped incorrectly, and its absence before a coordinating conjunction joining two independent clauses is one of the single most common comma errors, covered in detail in Part 5, Lesson 1. Two independent clauses can also be joined with a semicolon alone, with no conjunction at all, when the ideas are closely related: “I wanted to go; it was raining.” This semicolon usage is covered fully in Part 5, Lesson 2. A genuinely important related error: joining two independent clauses with ONLY a comma and no conjunction is called a comma splice, and is incorrect: “I wanted to go, it was raining” is a comma splice error, distinct from the correctly punctuated compound sentence above — this specific error is revisited in Part 2, Lesson 6 alongside run-on sentences.Practice Questions
1. What does a compound sentence join together?
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Two or more independent clauses.2. What seven words make up the coordinating conjunctions, as introduced earlier in the course?
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For, and, nor, but, or, yet, so (FANBOYS).3. Where does the comma go relative to the coordinating conjunction in a compound sentence?
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Before it.4. Write a compound sentence joining “I wanted to go” and “it was raining” with “but.”
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I wanted to go, but it was raining.5. Can two independent clauses be joined with a semicolon alone, without a conjunction?
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Yes, when the ideas are closely related.6. What later lesson covers semicolon usage in full?
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Part 5, Lesson 2.7. What is a comma splice?
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Joining two independent clauses with only a comma and no conjunction.8. Is “I wanted to go, it was raining” correctly punctuated?
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No, it is a comma splice error.9. What later lesson revisits comma splices alongside run-on sentences?
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Part 2, Lesson 6.10. Is the comma before a coordinating conjunction required when joining two independent clauses?
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Yes.11. What later lesson covers this specific comma-placement rule in detail?
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Part 5, Lesson 1.12. Are both halves of a correctly formed compound sentence able to stand alone as complete sentences?