Use semicolons with conjunctive adverbs (e.g., however, therefore) when appropriate.
Join independent clauses with a semicolon before conjunctive adverbs like however or therefore.
核心知识
Words like "however," "therefore," "moreover," and "consequently" are conjunctive adverbs, not coordinating conjunctions. When they appear between two independent clauses, they need a semicolon (or period) before them—not just a comma.
深入理解
This is one of the most commonly tested boundary rules on the SAT.
Conjunctive adverbs include: however, therefore, moreover, furthermore, consequently, nevertheless, meanwhile, otherwise, instead, likewise, accordingly.
These words feel like conjunctions, but grammatically they aren't. Compare:
Conjunction (comma works): "The data was incomplete, but the team published anyway."
Conjunctive adverb (comma doesn't work): "The data was incomplete, however, the team published anyway." ← comma splice
Correct versions:
→ "The data was incomplete; however, the team published anyway."
→ "The data was incomplete. However, the team published anyway."
Notice the pattern: semicolon + conjunctive adverb + comma. The semicolon handles the clause boundary. The comma after the conjunctive adverb is standard but sometimes optional for short adverbs.
The SAT tests this by offering options with different punctuation before and after words like "however" or "therefore."
分步讲解
- Spot the transition word between two clauses (however, therefore, moreover, etc.).
- Confirm it's a conjunctive adverb, not a FANBOYS conjunction.
- Check: is there an independent clause on both sides of the transition word?
- If yes, the boundary before the conjunctive adverb needs a semicolon or period—not a comma.
- After the conjunctive adverb, a comma is standard.
常见误解
- "'However' works the same as 'but.'" Grammatically, they don't. "But" is a coordinating conjunction (comma + but works). "However" is a conjunctive adverb (needs a semicolon or period before it).
- "You always need a semicolon before 'however.'" Only when "however" sits between two independent clauses. In "However difficult the test was, she passed," no semicolon is needed—"however" modifies "difficult," not a clause boundary.
- "A comma after 'therefore' is always required." It's standard but sometimes omitted for brevity, especially in short sentences.
示例解析
Neuroscientist Dr. Amara Osei's research has shown that bilingual individuals often develop symptoms of dementia several years later than monolingual ______ she cautions that bilingualism is only one of many factors influencing cognitive decline.
Which choice completes the text so that it conforms to the conventions of Standard English?
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