Boundaries Punctuation and Grammar Flashcards

Which version of the sentence correctly uses punctuation to join two independent clauses? A scholar who studies linguistic evolution argues that language change is inevitable; she also contends that prescriptive grammar rules often lag decades behind actual usage.

Answer: A scholar who studies linguistic evolution argues that language change is inevitable; she also contends that prescriptive grammar rules often lag decades behind actual usage.

A semicolon correctly joins two closely related independent clauses of equal grammatical weight without a coordinating conjunction. Choice B creates a comma splice. Choice C uses a colon, which is reserved for introducing elaboration, a list, or a direct explanation of what precedes it — not for joining two parallel independent observations. Choice D uses an em dash, which can work in informal writing but implies an abrupt shift or dramatic pause not warranted here.

The following sentence contains an underlined portion. Choose the option that best corrects it. The committee's report, which had been compiled over eighteen months and reviewed by three independent auditors, were eventually published without the dissenting appendix.

Answer: auditors, was eventually published

The subject of the verb is 'report' (singular), not 'auditors.' The long relative clause 'which had been compiled over eighteen months and reviewed by three independent auditors' is a nonrestrictive modifier set off by commas — it does not change the subject. Therefore, the verb must be 'was.' The comma before 'was' is correct because it closes the nonrestrictive clause. Choice C incorrectly uses a semicolon mid-sentence between a subject and its verb.

Which sentence correctly applies a colon?

Answer: She had one ambition: to map every unmeasured river delta on the continent.

A colon must be preceded by a complete independent clause. In choice B, 'She had one ambition' is a complete clause, and the colon introduces what that ambition was — a classic, correct colon use. Choice A incorrectly places a colon between a verb ('required') and its direct objects; no colon is needed there. Choice C places a colon between a verb ('debate') and its object clause, which is also incorrect. Choice D inserts a colon between a linking verb ('were') and its predicate, disrupting the clause.

Select the version that correctly punctuates the appositive phrase.

Answer: The architect Zaha Hadid, widely regarded as a pioneer of deconstructivist design, transformed the field with her fluid, organic structures.

The appositive 'Zaha Hadid' is restrictive here — it identifies which architect is meant — so it takes no commas. However, the longer nonrestrictive phrase 'widely regarded as a pioneer of deconstructivist design' requires a pair of commas to set it apart. Choice C is the only option that correctly omits commas around 'Zaha Hadid' while enclosing the longer modifier in commas. Choice A is missing the closing comma after 'design.' Choices B and D misplace the comma pairs.

A student writes the following. Which punctuation choice correctly handles the transition? 'The methodology was sound. _______ the sample size was too small to yield statistically significant results.'

Answer: The methodology was sound; however, the sample size was too small to yield statistically significant results.

When a conjunctive adverb like 'however' connects two independent clauses, it must be preceded by a semicolon (or a period starting a new sentence) and followed by a comma. Choice C correctly uses a semicolon before 'however' and a comma after it. Choice A omits the comma after 'however.' Choice B uses a comma before 'however,' creating a comma splice — 'however' is not a coordinating conjunction. Choice D omits the required comma after 'however.'

Which sentence correctly uses an em dash?

Answer: Three factors—funding, personnel, and timeline—were cited as the primary obstacles.

Em dashes must come in pairs when setting off a mid-sentence interruption, just as parentheses do. Choice A correctly flanks the list 'funding, personnel, and timeline' with an em dash on each side. Choice B closes with a comma instead of a second em dash, creating an asymmetric construction. Choice C opens with a comma and closes with an em dash — also asymmetric. Choice D opens the em dash but never closes it, leaving the sentence structurally ambiguous.