Worked Examples: Standard English Conventions

Example 1: Comma Splice vs. Semicolon (Easy–Medium)

The orchestra performed a challenging piece by Shostakovich _____ the audience responded with a standing ovation.

Choices:

• A) "piece by Shostakovich, the" (comma splice — two independent clauses)
• B) "piece by Shostakovich; the" (semicolon — correct)
• C) "piece by Shostakovich the" (run-on — no punctuation)
• D) "piece by Shostakovich. And the" (awkward fragment after period)

Answer: B. Both clauses are independent and closely related.

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Example 2: Subject-Verb Agreement with Intervening Phrase (Medium)

The impact of rising sea levels on coastal ecosystems _____ a primary concern for environmental scientists.

"Impact" (singular) is the subject — not "levels" or "ecosystems."

Answer: "remains" (singular verb to match "impact").

Trap: "remain" (plural) sounds right because "ecosystems" is nearby.

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Example 3: Dangling Modifier (Medium–Hard)

Having analyzed data from over 500 patients, _____.

What follows the comma must be the person who analyzed the data.

• Wrong: "the results suggested a correlation between diet and heart disease." (Results didn't analyze data.)
• Wrong: "a correlation between diet and heart disease was identified." (A correlation didn't analyze data.)
• Right: "the research team identified a correlation between diet and heart disease." (The team analyzed — correct.)

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Example 4: Colon Usage (Medium)

The museum's new exhibit focuses on one theme _____ the influence of Japanese woodblock prints on French Impressionism.

The clause before the blank ("The museum's new exhibit focuses on one theme") is independent and introduces a specific theme. A colon is correct.

Answer: "theme: the influence of..."

Trap: A semicolon would require an independent clause after it. "The influence of Japanese woodblock prints on French Impressionism" is a noun phrase, not an independent clause.

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Example 5: Nonrestrictive Clause (Hard)

The Voyager 1 spacecraft _____ has traveled farther from Earth than any other human-made object.

If the blank contains a nonrestrictive clause (extra information about Voyager 1), it needs commas on BOTH sides:

• Right: "The Voyager 1 spacecraft, which was launched in 1977, has traveled..."
• Wrong: "The Voyager 1 spacecraft, which was launched in 1977 has traveled..." (missing closing comma)
• Wrong: "The Voyager 1 spacecraft which was launched in 1977, has traveled..." (missing opening comma)

Both commas or neither — never just one.