All High-Yield Topics
SATStandard English Conventions
SATAdvanced (700+)Frequency: 3 - 4 questions

Semicolons, Colons, and Single Dashes

Semicolons (;) link two independent clauses without a conjunction. Colons (:) and single dashes (-) MUST follow a complete independent clause to introduce an explanation, list, or dramatic elaboration.

Core Formula & Concept Cheat Sheet

1Independent Clause ; Independent Clause
2Independent Clause : Explanation / List / Amplification
3Semicolon equals Period (.) in standard SAT grammar rules.

The 700+ Score Trap

Placing a colon after a verb like 'including', 'such as', or 'are' where the preceding clause is incomplete.

Test Your Mastery

Official Exam Format

Live Interactive Practice Drill

Instant Validation
Which choice completes the text so that it conforms to the conventions of Standard English? Astrophysicists analyzing the James Webb Space Telescope data discovered an unexpected phenomenon ______ several ancient galaxies formed billions of years earlier than theoretical models predicted.

Frequently Asked Questions

Can a colon be followed by an independent clause?

Yes! Unlike a semicolon which only links clauses, a colon can be followed by a full clause, a single word, or a phrase, as long as what comes BEFORE it is an independent clause.