SAT Writing: Sentence Structure and Formation

Mastering sentence structure isn't just about grammar rules—it's about crafting clear, effective, and logical prose, a skill the SAT Writing and Language section directly tests. Your ability to identify and fix flawed sentences can significantly impact your score, as these questions assess the foundational clarity of your writing. Understanding how to properly connect ideas will help you tackle a substantial portion of the test with confidence.

The Building Blocks: Independent and Dependent Clauses

Every complete sentence is built from clauses. An independent clause contains a subject and a verb and expresses a complete thought; it can stand alone as a sentence. A dependent clause (or subordinate clause) also has a subject and verb but does not express a complete thought; it depends on an independent clause to make sense.

For example: "She studied for the SAT" is an independent clause. "Because she studied for the SAT" is a dependent clause; it leaves you hanging. Recognizing these units is the first step to diagnosing and correcting structural errors. The SAT tests your skill in joining these clauses correctly and identifying when a clause is improperly presented as a complete sentence.

Correcting Sentence Fragments

A sentence fragment is an incomplete sentence presented as if it were complete. Fragments often lack a main verb, a subject, or a complete thought, frequently appearing as dependent clauses standing alone. On the SAT, you must recognize fragments and combine them with a neighboring independent clause or rewrite them to be complete.

Example Fragment: Glancing at the complicated grammar question.

How to Correct It: You can attach it to an independent clause: Glancing at the complicated grammar question, the student took a deep breath. Or, you can rewrite it to be independent: She glanced at the complicated grammar question.

The test will often place the fragment next to the sentence it logically belongs to. Your job is to identify the best way to attach it seamlessly.

Fixing Run-On Sentences and Comma Splices

A run-on sentence occurs when two or more independent clauses are joined without appropriate punctuation or a conjunction. A comma splice is a specific type of run-on where two independent clauses are incorrectly joined by just a comma. The SAT will present these errors and ask you to choose the best correction.

Example of a Comma Splice: The SAT Writing section is challenging, it requires careful attention to detail.

This sentence incorrectly uses only a comma to connect two independent clauses ("The SAT Writing section is challenging" and "it requires careful attention to detail"). You have four primary strategies to fix it:

1. Use a period: Create two separate sentences.
2. Use a semicolon: The SAT Writing section is challenging; it requires careful attention to detail.
3. Use a comma and a coordinating conjunction (FANBOYS): The SAT Writing section is challenging, for it requires careful attention to detail.
4. Use a subordinating conjunction to make one clause dependent: The SAT Writing section is challenging because it requires careful attention to detail.

The correct choice on the SAT will depend on the context and the emphasis of the surrounding sentences.

Mastering Coordination and Subordination

Choosing the right connector determines the relationship between your ideas. Coordinating conjunctions (For, And, Nor, But, Or, Yet, So) join elements of equal grammatical rank, like two independent clauses. Subordinating conjunctions (because, although, while, if, since) introduce a dependent clause, showing its relationship (cause, contrast, condition, time) to the main clause.

Faulty subordination occurs when the subordinating conjunction creates an illogical or awkward relationship. The SAT tests your ability to choose the most logical connector based on the sentence's meaning.

Example of Faulty Subordination: Although she practiced daily, her score improved.

The word "although" sets up a contrast, but there is no contrast between practicing and improving; it's a cause-and-effect relationship. A better correction would be: Because she practiced daily, her score improved.

Always ask yourself: what is the actual relationship between these two ideas? Then select the conjunction (or punctuation) that precisely conveys that logic.

Strategic Punctuation: Semicolons, Colons, and Dashes

Beyond commas and conjunctions, the SAT tests your understanding of stronger punctuation.

• A semicolon ($;$) can connect two closely related independent clauses.
• A colon ($:$) introduces an explanation, list, or quotation that follows from the first clause.
• A dash ($—$) can set off an abrupt change in thought or a parenthetical element for emphasis.

Key Distinction: The text before a semicolon must be an independent clause, and the text after it must also be an independent clause. The text before a colon must be an independent clause, but what follows can be a list, phrase, or dependent clause. On the test, if you see a semicolon, immediately check that both sides are complete standalone sentences.

Common Pitfalls

Pitfall 1: Mistaking a Long Phrase for a Sentence. Just because a group of words is long doesn't mean it's a complete sentence. Check for the core subject and verb. For example, "Running through the various strategies for sentence correction on the practice test" is a fragment, lacking a main subject and verb.

Pitfall 2: Using a Comma Before a Subordinating Conjunction When it's Not Needed. If the dependent clause comes after the independent clause, you usually don't need a comma. Incorrect: She felt prepared, because she had studied. Correct: She felt prepared because she had studied. Use a comma only when the dependent clause comes first.

Pitfall 3: Overcorrecting a Correct Sentence. The SAT often includes correctly punctuated sentences as answer choices. Don't change a properly used semicolon or a well-placed comma just because the sentence looks complex. If the clauses are independent and related, a semicolon may be perfect.

Pitfall 4: Ignoring Context When Combining Sentences. Many questions ask for the best way to combine two sentences. The best answer isn't just grammatically correct; it is the most concise and logical within the paragraph. Avoid choices that are wordy or that change the intended meaning.

Summary

• A sentence fragment is an incomplete thought; correct it by attaching it to a main clause or adding missing elements.
• A comma splice incorrectly joins two independent clauses with only a comma; fix it with a period, semicolon, comma + FANBOYS, or subordination.
• Use coordinating conjunctions (FANBOYS) to join equal ideas and subordinating conjunctions (because, although) to show a dependent relationship, ensuring the logic is sound.
• A semicolon connects two closely related, independent clauses. The text on both sides must be able to stand alone as a sentence.
• Always examine the logic and context of the entire sentence and surrounding text when selecting the correct correction on the SAT.