Standard English Conventions · Reading & Writing
Boundaries
Where sentences begin and end, and which punctuation is allowed to join what. Periods, semicolons, colons, commas with conjunctions, and the boundaries between clauses.
52 questions in the bank · 13 easier · 26 medium · 13 harder · this domain is ≈26% of the section
What to watch for
Decide first whether each side of the punctuation could stand alone as a sentence. Two independent clauses need a period, a semicolon, a colon, or a comma plus a conjunction — a comma alone is a splice.
How the question is worded
These are the actual stems used in the bank — the SAT reuses a small set of wordings, and recognising them saves time on test day.
- Which choice completes the text so that it conforms to the conventions of Standard English?
Worked examples
easyThe ecologist James Estes spent five decades showing that sea otters keep kelp…
The ecologist James Estes spent five decades showing that sea otters keep kelp forests standing by eating the urchins that graze them. Sea otters wrap themselves in strands of kelp before they sleep. The kelp anchors them in place ______ the current would otherwise carry them far from their feeding grounds overnight.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A. otherwise;
- B. otherwise, and
- C. otherwise
- D. otherwise,
Answer: A. otherwise;
Explanation
Both statements are independent clauses — each could stand alone as a sentence. A semicolon is one of the legal ways to join two independent clauses. A comma alone creates a comma splice, nothing at all creates a fused sentence, and adding "and" after a comma would work only if the comma came before the conjunction.
mediumThe Coast Guard's lighthouse automation program ran from 1968 until 1990, and …
The Coast Guard's lighthouse automation program ran from 1968 until 1990, and Boston Light survives as the one station Congress requires to keep a keeper. Lighthouse keepers once trimmed wicks and wound clockwork machinery through the night. Automation ended that way of life almost ______ by the 1990s, nearly every lighthouse in the United States ran without a resident keeper.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A. entirely:
- B. entirely
- C. entirely, for example,
- D. entirely,
Answer: A. entirely:
Explanation
The second clause — nearly every lighthouse running unstaffed — is a specific illustration of the first claim, and a colon is the mark that introduces an explanation or elaboration after a complete clause. The comma alone splices; no punctuation fuses; and "for example" between commas still leaves a comma splice.
hardGlassmakers on Murano have kept furnaces burning almost continuously since 129…
Glassmakers on Murano have kept furnaces burning almost continuously since 1291, when the Venetian Senate moved the industry off the main islands to contain the fire risk. Because glass conducts heat poorly, a glassblower's furnace must stay near 1,100°C all ______ cooling and reheating the tank daily would crack its ceramic lining and waste more fuel than continuous firing does.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A. week: shutting it down nightly is a false economy, since
- B. week shutting it down nightly is a false economy, since
- C. week: shutting it down nightly is a false economy: since
- D. week, shutting it down nightly is a false economy, since
Answer: A. week: shutting it down nightly is a false economy, since
Explanation
After the complete clause ending in "all week," a colon legally introduces the explanation, and the "since" clause attaches to that explanation with just a comma. Option D splices the first two clauses; B fuses them; C's second colon after "economy" cannot be followed by a subordinate "since" clause functioning this way — one boundary mark per join.