205.1 Section Title
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You must read each slide, and complete any questions on the slide, in sequence.
Exercise P1-17
All uses of the comma
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In each pair, click on the sentence that is correctly punctuated. In the correct sentence, all commas that appear are necessary.
Click Submit after each question to see feedback and to record your answer. After you have finished every question, your answers will be submitted to your instructor’s gradebook. You may review your answers by returning to the exercise at any time. (An exercise reports to the gradebook only if your instructor has assigned it.)
Example
Question
Correct. Commas are needed to separate items in a series, and a comma is needed to set off an introductory word group. For more help, see section P1.
Sorry. There should be no comma before the coordinating conjunction and because the word group after the conjunction is not an independent clause (a word group that can stand alone as a sentence). For more help, see section P1.
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Question
Correct. The which clause is nonrestrictive (not necessary for defining which car is meant), so it should be set off with a comma. For more help, see section P1.
Sorry. Although the comma after the introductory word group is correct, there should be a comma between the coordinate adjectives large and measurable. For more help, see section P1.
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Question
Correct. The comma before the coordinating conjunction and is correct because the conjunction joins independent clauses. For more help, see section P1.
Sorry. The which clause should be set off with a comma because it is nonrestrictive (not necessary for defining which dog is meant). For more help, see section P1.
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Question
Correct. Commas are correctly used around elements in the date. For more help, see section P1.
Sorry. There should be a comma before the coordinating conjunction but because the conjunction joins independent clauses (word groups that can stand alone as sentences). For more help, see section P1.
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Question
Correct. Commas are needed to set off an element of contrast. For more help, see section P1.
Sorry. When the conjunctive adverb however appears in the middle of an independent clause, it should be set off with a pair of commas. For more help, see section P1.
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Question
Correct. A comma is needed to set off the introductory transitional phrase. For more help, see section P1.
Sorry. A comma is needed after the word Yes. For more help, see section P1.
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Question
Correct. A comma is used correctly after the introductory participial phrase. For more help, see section P1.
Sorry. A comma is needed after stool. Simply a bicycle wheel mounted on a stool is a nonrestrictive appositive that merely adds extra information about a noun that has already been clearly identified. Nonrestrictive word groups are set off with commas. For more help, see section P1.
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Question
Correct. All of the commas are correct: The first two separate items in a series, the third follows an introductory word group, and the last one sets off a direct quotation. For more help, see section P1.
Sorry. There should be no comma between the cumulative adjectives cheap and tin. (Cumulative adjectives cannot be when joined with and: cheap and tin horn.) For more help, see section P1.
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Question
Correct. The which clause is nonrestrictive (not necessary for defining chlorine), so it should be set off with a comma. For more help, see section P1.
Sorry. A comma is needed between the day and the year: January 15, 2012. For more help, see section P1.
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Question
Correct. The comma correctly sets off the nonrestrictive appositive a young researcher, which describes a noun that has already been clearly defined. For more help, see section P1.
Sorry. There should be no comma before the coordinating conjunction and because the word group after and is not an independent clause (a word group that can stand alone as a sentence). For more help, see section P1.
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