ExamAdept

Choose the sentence that uses commas correctly according to standard English grammar.

A:

After a long day of work, John, a dedicated employee, always makes time for his family.

B:

Despite the clear warning the climbers decided to attempt the difficult ascent.

C:

Many people, believe that technology has improved their lives significantly.

D:

My neighbor who is an excellent baker brought us a delicious cake yesterday.

Answer: A

Option A correctly uses a comma after the introductory phrase "After a long day of work" and uses commas to set off the non-essential appositive phrase "a dedicated employee." Option B incorrectly omits a comma after the introductory phrase "Despite the clear warning." Option C incorrectly places a comma between the subject "people" and its verb "believe." Option D incorrectly omits commas to set off the non-essential relative clause "who is an excellent baker."

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Choose the sentence that correctly uses a comma when two independent clauses are joined by a coordinating conjunction.

A: The children played in the garden, and their parents watched from the porch.

B: She wanted to visit the museum, but decided to go to the park instead.

C: He practiced the piano for hours yet he still made a few mistakes during the recital.

D: The storm raged all night and, the power went out early in the morning.

Answer: A

Option A is correct because it uses a comma before the coordinating conjunction "and" to separate two independent clauses: "The children played in the garden" and "their parents watched from the porch." Option B is incorrect because "decided to go to the park instead" is not an independent clause; it is part of a compound predicate, so no comma is needed before "but." Option C is incorrect because a comma is missing before the coordinating conjunction "yet," which connects two independent clauses. Option D is incorrect because the comma is placed after the coordinating conjunction "and" instead of before it.

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Which sentence correctly uses commas to set off nonessential information?

A: The Amazon River, which flows through South America, is the largest river by discharge volume.

B: My neighbor, who is an excellent baker makes delicious cookies.

C: The car that I bought last year, needs new tires.

D: Her older brother, an aspiring musician practices daily.

Answer: A

The phrase "which flows through South America" is nonessential, providing extra information about the Amazon River, which is already clearly identified. It is correctly enclosed by two commas. Option B is incorrect because "who is an excellent baker" is nonessential information and requires a second comma after "baker" to be properly set off. Option C is incorrect because "that I bought last year" is essential information, specifying *which* car. Essential clauses should not be set off by commas. Option D is incorrect because "an aspiring musician" is a nonessential appositive phrase and requires a second comma after "musician" to be correctly set off.

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Choose the sentence that is correctly punctuated with an introductory dependent clause.

A: Before the presentation began, the speaker adjusted the microphone.

B: Unless you complete the assignment by tonight you will not receive credit.

C: While, she waited for the bus, it began to rain.

D: If the electricity goes out; the emergency lights will activate automatically.

Answer: A

Option A is correct because an introductory dependent clause ("Before the presentation began") is correctly followed by a comma before the main clause. Option B is incorrect as it misses the necessary comma after the introductory dependent clause ("by tonight"). Option C is incorrect because the comma is unnecessarily placed immediately after "While," incorrectly splitting the introductory dependent clause. Option D is incorrect because a semicolon is used instead of a comma to separate the introductory dependent clause from the main clause.

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Choose the correctly punctuated sentence.

A: Although the weather was terrible, we decided to go for a hike, and we brought our rain gear just in case.

B: Although the weather was terrible we decided to go for a hike, and we brought our rain gear just in case.

C: Although the weather was terrible, we decided to go for a hike and we brought our rain gear just in case.

D: Although the weather was terrible we decided to go for a hike and we brought our rain gear just in case.

Answer: A

Option A is correct because it correctly places a comma after the introductory dependent clause ("Although the weather was terrible") and before the coordinating conjunction "and" that joins two independent clauses. Option B is incorrect for omitting the comma after the introductory clause. Option C incorrectly omits the comma before the coordinating conjunction "and." Option D is incorrect as it omits both necessary commas.

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Questions for: Commas