Question
Read this sentence.
The Colosseum in Rome, Italy which is considered one of the “new” Seven Wonders of the World, is the largest amphitheater ever built and could hold more than 50,000 spectators.
Which edit should be made to correct the sentence?
- ADelete the comma after Rome.
- BInsert a comma after Italy.
- CDelete the comma after World.
- DInsert a comma after built.
Show the answer
Correct answer: B
The question asks for the correction needed for an error in the sentence. The sentence needs a comma to set off the clause “which is considered one of the ‘new’ Seven Wonders of the World,” because the clause is not essential to the meaning of the sentence (nonrestrictive clause).
Option B is correct because it places a comma where it is needed, after “Italy,” to set off the nonrestrictive clause that follows.
Option A is incorrect because when a name has more than one element, a comma is used to separate the elements for clarity.
Option C is incorrect because it would remove the comma at the end of the nonrestrictive clause, which should be set off by commas at the beginning and the end.
Option D is incorrect because a comma after “built” would separate the phrase “could hold more than 50,000 spectators,” which is part of a compound predicate that uses the subject from the main clause and so needs to stay connected to the rest of the sentence.
Question analysis
This punctuation question gives one long sentence about the Colosseum in Rome and asks which single comma edit makes it correct. Students apply the comma rules for place names and for nonessential clauses. The long subject makes it tricky, because every comma has to be weighed: added, removed or left alone.
- NYS standards
- 7L2 capitalization, punctuation, and spelling
- Grade level
- Grade 6 reading and task
- Compared with grade 7
- Below grade 7 Comma rules for place names and for extra information in mid-sentence are grade 6 punctuation, tested here in one short sentence with a single edit. Grade 7 editing usually moves on to clauses, modifiers and sentence combining.
- Estimated difficulty
- Straightforward: two steps or one careful reading.
- Thinking it demands
- Depth of knowledge 1, recall and reproduction · mainly apply
- What makes it hard
- A rule that doesn't sound wrong moderate
- Complex sentences minor
- Evidence
- Answered from one sentence or line
- Reading level
- Question and choices: about grade 6, 61 words.
- Corrected from the DOE handbook
- A grammar term in the explanation was corrected.
- Students, last 30 days
- Not enough answers yet to show (it takes 10).
Why it is hard, traps and wrong answers (shows the answer)
Why it is hard
Most students who miss this question can find the which-clause but treat its two edges differently: they see the closing comma after “World” as an error and never notice that the opening comma is missing. The question rewards marking where the extra description begins and ends before judging any single comma. Knowing that a city and its country are always separated settles the rest quickly.
A rule that doesn't sound wrong moderate Working it out
The missing comma after “Italy” does two jobs at once, closing the city–country pair and opening the which-clause, and “Rome, Italy which is considered” reads smoothly enough that few students hear the gap. (Connors & Lunsford, 1988)
Complex sentences minor Understanding the question
The sentence packs a place name, a nonessential which-clause and a compound predicate (“is the largest amphitheater ever built and could hold”) into 30 words, so every comma has to be placed within that structure. (Abedi & Lord, 2001; Freedle & Kostin, 1993; Messick, 1989)
Strategy: Mark where the extra description of the Colosseum begins and ends, then ask of each comma whether it separates a city from its country, sets off that description, or splits subject from verb.
The wrong answers, classified
A Punctuation (Connors & Lunsford, 1988)
Treats Rome and Italy as one name that needs no comma between them, not knowing that a comma always separates a city from its state or country.
C Punctuation (Connors & Lunsford, 1988)
Applies the real rule against a comma between subject and verb to the comma after “World,” missing that it closes the which-clause and must stay.
D Punctuation (Connors & Lunsford, 1988)
Adds a comma wherever the long sentence seems to pause, before “and could hold,” though that second verb shares the subject and takes no comma.
What was corrected from the DOE handbook, and why
- Explanation: The handbook calls “could hold more than 50,000 spectators” a dependent clause. It has no subject of its own: it is the second half of a compound predicate (the Colosseum “is the largest amphitheater ever built and could hold…”), which is why no comma goes before it. The site now calls it “part of a compound predicate.”
Working it out, step by step
Figure out what the question asks
This is a punctuation question. Punctuation means marks like commas and periods. The sentence has one comma mistake. You need the one edit that fixes it. Two comma rules decide it.
Learn the rule for extra information
Some groups of words just add an extra fact. The sentence still makes sense without them. Grammar books call this a nonessential clause. Put a comma before it and a comma after it, like a pair of brackets.
Example: My dog, which is brown, likes to swim. Take out the middle part and you still have My dog likes to swim.
Find the extra part in this sentence
Here the extra part starts with “which is considered” and ends with “of the World.” It gives a fun fact about the Colosseum. Without it, the sentence still works: The Colosseum in Rome, Italy, is the largest amphitheater ever built.
There is a comma at the end of the extra part, after “World.” But there is no comma at the start, after “Italy.” That is the mistake.
Learn the rule for places
When you name a city and then its country, put a comma between them. If the sentence keeps going, put another comma after the country. Example: We flew to Paris, France, last May.
So “Rome, Italy” needs a comma after “Italy” too. Here one comma does both jobs.
Check each choice
- A is wrong. The comma between “Rome” and “Italy” must stay. It splits the city from the country.
- B is right. It adds the missing comma at the start of the extra part.
- C is wrong. The comma after “World” closes the extra part, so it must stay.
- D is wrong. “Could hold” shares its subject, “The Colosseum,” with “is.” No comma goes before a second verb like that. Example: Sam ran home and ate lunch.
Watch out: C is tempting. A comma between a subject (who or what the sentence is about) and its verb (the action word) is usually wrong. Here it is fine, because it is the second comma of the pair.
Choose the answer
With the new comma, the extra part has a comma on each side. So the answer is B: insert a comma after Italy.
Why this answer and not the closest wrong one
C is the closest wrong answer. It treats the comma after “World” as a mistake. But that comma ends the extra part. If you delete it, the extra part has no comma at either end. B adds the missing first comma, so both ends are marked.
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The original DOE question
