Standard English Conventions account for approximately 26% of all Reading & Writing questions (11 to 15 questions per test).
Unlike literary analysis or vocabulary memorization, grammar questions follow deterministic, binary mathematical rules. Once you master the rules, you can answer every grammar question with 100% accuracy.
1. The 4 Punctuation Tiers on the SAT
Every punctuation question tests clause boundaries. There are only two types of clauses:
- Independent Clause (IC): Contains a subject and a verb and expresses a complete thought. Can stand alone as a complete sentence.
- Dependent Clause (DC): Contains a subject and verb but begins with a subordinating conjunction (e.g., Although, Because, While, Since) or relative pronoun (e.g., which, that, who). Cannot stand alone.
2. Semicolons & Periods: Independent Clauses
On the SAT, a period (.) and a semicolon (;) perform identical grammatical functions: they separate two independent clauses.
[Independent Clause] ; [Independent Clause]
[Independent Clause] . [Independent Clause]
3. Colons & Single Dashes: The Announcement Rule
A colon (:) or single em dash (—) introduces an explanation, list, definition, or dramatic conclusion.
The non-negotiable rule on the SAT:
- Before the colon: Must be a 100% complete Independent Clause.
- After the colon: Can be an Independent Clause, a Dependent Clause, a list, or a single word.
Correct Example:
The archaeologist discovered a rare artifact: a Bronze Age ceremonial dagger. (Independent clause before colon).
Incorrect Example:
The artifacts discovered included: daggers, coins, and pottery. (Incomplete clause before colon).
4. Comma Splices & FANBOYS Coordination
A comma splice occurs when two independent clauses are joined by a comma alone without a coordinating conjunction. This is always grammatically incorrect on the SAT.
To join two independent clauses with a comma, you must include a FANBOYS conjunction (For, And, Nor, But, Or, Yet, So):
[Independent Clause] , and [Independent Clause]
5. Dangling & Misplaced Modifiers
When a sentence opens with an introductory modifying phrase (a phrase describing an action without its own subject), the noun being modified must immediately follow the comma.
- Incorrect: Walking through the museum, ancient dinosaur fossils caught the student's attention. (Implies the fossils were walking).
- Correct: Walking through the museum, the student noticed ancient dinosaur fossils. (The student was walking).
6. Apostrophes & Possessive Pronouns
| Pronoun / Noun | Meaning | Example |
|---|---|---|
| It's | Contraction for It is or It has | It's raining outside. |
| Its | Singular Possessive pronoun | The camera lost its lens cap. |
| Its' | DOES NOT EXIST | Never correct on the SAT. |
| They're | Contraction for They are | They're studying in the library. |
| Their | Plural Possessive pronoun | The students submitted their exams. |
| There | Location or existential pronoun | Put the book over there. |
| Student's | Singular Possessive (one student) | The student's desk. |
| Students' | Plural Possessive (multiple students) | The students' desks. |
Practice these rules on SAT.ng Standard English Conventions Drills.