Master Standard English Conventions with 150+ adaptive practice questions. This domain makes up 26% of the SAT Reading & Writing section (12-19 questions on test day).
150+
Questions
26%
of Reading & Writing
12-19
Qs on test day
3
Difficulty levels
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Sentence boundary questions—comma splices, run-ons, and fragments—are the most heavily tested grammar concept on the Digital SAT. Master three rules: (1) two independent clauses need a period, semicolon, or comma + coordinating conjunction; (2) a comma alone between two independent clauses is always wrong; (3) a dependent clause attached to an independent clause is one sentence, not two. Drilling these three patterns will earn you several easy points.
Subject-verb agreement errors are designed to confuse you with long modifying phrases between the subject and verb. Train yourself to mentally cross out prepositional phrases and relative clauses to find the true subject. For example, in “The collection of rare manuscripts are valuable,” the subject is “collection” (singular), so the verb should be “is.” This technique works on nearly every agreement question.
When a question asks you to punctuate a sentence, read the sentence before and after it as well. The SAT often tests whether a phrase is essential (no commas) or nonessential (commas on both sides). If removing the phrase changes the meaning of the sentence, it’s essential and should not be set off by commas. Context makes this determination much easier.
Standard English Conventions questions are the most “rule-based” on the SAT, which means they respond well to targeted practice. Set a timer and work through 10–15 grammar questions in one sitting. Review every mistake immediately and write down the rule you violated. After a few weeks of this routine, you will start recognizing patterns instantly on test day.
Missing comma splice errors
A comma between two independent clauses (without a coordinating conjunction) is one of the most common errors students overlook. If both sides of the comma could stand alone as sentences, you need a period, semicolon, or conjunction.
Losing track of the subject in long sentences
When a sentence has multiple modifying phrases, students often match the verb to the nearest noun instead of the true subject. Always trace back to find the grammatical subject.
Adding unnecessary commas around essential clauses
If a clause identifies which specific noun is being discussed (essential/restrictive), it should not be set off by commas. Removing the clause would change the sentence’s meaning.
Ignoring parallel structure
Items in a list or comparison must follow the same grammatical form. If the first two items are gerunds, the third must be a gerund as well. Check every list for consistency.