Standard English Conventions · ~26% of Reading & Writing
50+ free practice questions, every answer explained.
Boundaries tests sentence boundaries and the punctuation that marks them: periods, semicolons, colons, commas, and dashes, including comma splices, run-ons and the punctuation around supplementary elements. Every question is answerable from the sentence in front of you, without knowing anything about the subject matter.
Ignore how the sentence sounds and test the structure instead. Decide whether the material on each side of the punctuation is an independent clause — a subject and a verb that could stand alone. Two independent clauses need a period, a semicolon, or a comma plus a coordinating conjunction; a colon needs an independent clause on its left; a supplementary phrase needs the same mark on both sides, and never a comma on one side and a dash on the other.
Punctuating by where you would pause when reading aloud. Pauses are not grammar, and the SAT builds wrong answers precisely where a natural pause falls in a place no punctuation belongs. Check the clauses instead — it is a mechanical test with a definite answer.
The composer's last symphony, unperformed during his lifetime was finally premiered decades later by a major orchestra.
Which choice fixes the punctuation error?
Answer: D. 'Unperformed during his lifetime' is a nonrestrictive phrase interrupting the sentence and needs a comma on both sides. The comma after 'symphony,' is already present, so a matching comma is needed after 'lifetime' before 'was.' Choice D supplies this.
50+ questions across 6 drills. Each drill is answered as a set — you see every explanation at once, at the end.
10 Boundaries questions, easiest first, every answer explained.
Start drill 1 → Drill 210 Boundaries questions, easiest first, every answer explained.
Start drill 2 → Drill 310 Boundaries questions, easiest first, every answer explained.
Start drill 3 →Drills 4–6 continue from the end of drill 3 — each drill links to the next.
Grammar and punctuation — where sentences end, and whether verbs, pronouns and modifiers agree with what they belong to.
Boundaries tests sentence boundaries and the punctuation that marks them: periods, semicolons, colons, commas, and dashes, including comma splices, run-ons and the punctuation around supplementary elements. Every question is answerable from the sentence in front of you, without knowing anything about the subject matter.
Ignore how the sentence sounds and test the structure instead. Decide whether the material on each side of the punctuation is an independent clause — a subject and a verb that could stand alone. Two independent clauses need a period, a semicolon, or a comma plus a coordinating conjunction; a colon needs an independent clause on its left; a supplementary phrase needs the same mark on both sides, and never a comma on one side and a dash on the other.
Boundaries sits in the Standard English Conventions domain, which is ~26% of the Reading & Writing section — roughly 11–15 of its 54 questions. The College Board publishes weights by domain, not by individual skill, so an exact per-skill count is not something anyone can promise you.
No. Every question is original, written to the College Board's published Digital SAT Reading & Writing specification. No retired or copyrighted College Board material appears anywhere on this site.
50+ questions across 6 drills, all free, no account needed, every answer explained.