Grammar - Commas, Semicolons, and Colons - Quick Guides

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Study GuideGrammar–Commas, Semicolons, and Colons1.What Are Commas, Semicolons, and ColonsPunctuation helps your writing sound clear and natural. Commas, semicolons, and colons act likeroad signs for readers—they tell us when to pause, stop briefly, or get ready for more information.Let’s look at each one in a simple, student-friendly way.1.1Commas: Small Pauses That Add ClarityCommas show short pauses or breaks in a sentence. They help ideas flow smoothly and makesentences easier to understand.Some writers forget to use commas, while others use too many. Both problems can make sentencesconfusing or hard to read. The good news is that comma rules are clear and not difficult to learn.Once you understand them, your writing will feel more organized and polished.1.2Semicolons: Connecting Related IdeasSemicolons often confuse writers, but they have a clear purpose. A semicolon joins two independentclauses—complete ideas—that are closely related. It can also be used to separate items in a complexlist.Think of a semicolon as a stronger comma but not as strong as a period. It helps link ideas thatbelong together.1.3Colons: Introducing What Comes NextColons are used to point the reader toward something important that follows. They often introduce:•A list•A quotation or formal statement•An explanation or restatement of an ideaA colon tells the reader, “Pay attention—more information is coming.”

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Study GuideUse Them WiselyOne key rule for semicolons and colons is to use them sparingly. When used correctly, they makeyour writing clearer and more effective. When overused, they can distract the reader.2.Uses of the CommaCommas are small marks, but they do a lot of important work in writing. They help readers pause atthe right moments, understand relationships between ideas, and avoid confusion. This sectionexplains when to use commas, when not to use them, and how theyaffect meaning.2.1The Main Jobs of CommasCommas are commonly used in these situations:•After introductory clauses and phrases•To set off interruptions within a sentence•With nonrestrictive(nonessential) phrases and clauses•Between items or modifiers in a series•To join independent clauses when used with a coordinating conjunctionWhen commas join independent clauses, they must be followed by a coordinating conjunction:for, and, nor, but, or, yet, so(often remembered asFANBOYS).2.2Special Situations That Need CommasCommas are also used in certain standard cases, such as with:•Quotations•Dates•Addresses and locations•Numbers with four or more digits

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Study GuideAt the same time, commas shouldneverbe used:•Around restrictive (essential) clauses•Between a subject and its verb•Between a verb and its direct object2.3Thinking About Commas as You LearnWhen learning commas, keep two ideas in mind:1.A comma usually signals a pause.2.Some comma rules are flexible, as long as the meaning stays clear.Commas are the most commonly used punctuation mark inside sentences, and they also cause themost confusion. One reason is that different editors and writers use commas differently. Some writingstyles use many commas, while others use very few. Over time,the general trend has been towardusing fewer commas.2.4When a Comma Changes the MeaningSometimes a comma is absolutely necessary because it changes the meaning of a sentence.Example:•Because I wanted to help, Dr. Hodges, I pulled the car over to the side of the road.•Because I wanted to help Dr. Hodges, I pulled the car over to the side of the road.In the first sentence, the commas show that the speaker is talkingtoDr. Hodges.In the second sentence, Dr. Hodges is the person being helped.Many situations are less obvious than this, which is why careful comma use matters.2.5Joining Independent ClausesWhen you join two independent clauses with a coordinating conjunction, place a comma before theconjunction.

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Study GuideExamples:•Ryan never answered these charges,buthe was later forced to give up part of the money.•The novel lacks fully developed characters,andthe plot is filled with unlikely coincidences.If the clauses are short and closely related, the comma is optional.Examples:•It was an admirable scheme and it would work.•It was an admirable scheme, and it would work.However, donotuse a comma if the clauses are closely connected and no pause is needed.Correct:•The night was cold and the sky was clear.Incorrect:•The night was cold, and the sky was clear.2.6Avoiding Comma SplicesA comma must always be paired with a coordinating conjunction when joining independent clauses. Ifit isn’t, you create acomma splice, which is an error.Correct:•It had been a tumultuous year that had taken everybody by surprise, and it left therevolutionaries worse off than before.Incorrect:•It had been a tumultuous year that had taken everybody by surprise, it left the revolutionariesworse off than before.2.7Commas After Introductory ClausesIt is customary to use a comma after an introductory adverbial clause. If the clause is long, thecomma is essential.

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Study GuideExamples:•After she walked into the room, we stopped gossiping.•If you receive inappropriate material, acknowledge it by explaining why it won’t be published.If the clause is short and there is no risk of confusion, the comma may be omitted.Examples:•When she arrived we stopped gossiping.•After I turned sixteen I was allowed to stay out until midnight.2.8When a Missing Comma Causes ConfusionSometimes leaving out a comma makes a sentence confusing or even funny.Incorrect:•When we are cooking the children cannot come into the kitchen.Correct:•When we are cooking, the children cannot come into the kitchen.2.9Commas After Introductory PhrasesAphraseis a group of words without a subject and verb. If an introductory phrase is more than a fewwords long, it is usually followed by a comma. Always use a comma if there is any chance ofconfusion.Examples:•By taking the initiative to seek out story leads, a reporter will make a good impression.•At the beginning of the lecture, most of the students were wide awake.•Unlike many performances of the symphony, this one was spirited and lively.•Before eating, Cameron always runs two miles on the beach.Even short phrases sometimes need commas to avoid misunderstanding.

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Study Guide2.10Participial vs. Gerund PhrasesAparticipial phraseat the beginning of a sentence is always followed by a comma.Example:•Smiling and shaking hands, the senator worked her way through the crowd.Do not confuse this with agerund phrase, which acts as a noun and should not be followed by acomma.Compare:•Thinking of the consequences, she agreed not to release the memo. (comma needed)•Thinking of the consequences gave her a headache. (no comma)2.11Optional Commas After Short PhrasesFor very short introductory phrases, the comma is optional.Examples:•Later that day Jack and Linda drove to the ocean.•After the main course I was too full for dessert.A good test is to read the sentence aloud. If you naturally pause, use a comma.2.12Setting Off Interrupting ElementsSome words and phrases interrupt the flow of a sentence and should be enclosed in commas. Theseinclude:•Conjunctive adverbs•Transitional phrases•Names used in direct address2.13Conjunctive Adverbs and TransitionsWords likehowever, therefore, for example,andof courseusually take a comma when they begin asentence.

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Study GuideExamples:•For example, you shouldn’t use acid on soft surfaces.•Therefore, he refused to go with us.When they interrupt a sentence, they are enclosed in commas.Examples:•As the project moves along, of course, you will gain independence.•One who excels at research, for example, might work in the library.2.14Direct AddressNames or expressions used to speak directly to someone always need commas.Examples:•Fellow citizens, I ask for your support.•I tell you, Jason, I will not be forced into this.•Yes, readers, I am telling the truth.2.15Other InterruptionsAny element outside the main sentence flow should usually be set off with commas.Examples:•It is too early, I believe, to call the police.•The historical tour, we were told, was organized by experts.Dashes and parentheses can also be used, but commas are better when you want the interruption tofeel gentle.2.16Restrictive vs. Nonrestrictive ElementsThis is one of the most important comma rules.•Restrictive (essential)elements limit or define the noun. They donotuse commas.•Nonrestrictive (nonessential)elements add extra information. Theydouse commas.

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Study GuideCompare:•The women who arrived yesterday toured the island. (restrictive)•The women, who arrived yesterday, toured the island. (nonrestrictive)In the first sentence, only some women are meant. In the second, all the women are meant.More Examples•The workers who went on strike were replaced. (some workers)•The workers, who went on strike, were replaced. (all workers)Correct:•Workers who are over age sixty have difficulty finding jobs.Incorrect:•Workers, who are over age sixty, have difficulty finding jobs.2.17Practice with Restrictive and Nonrestrictive Elements•My brother, who is thirteen, watches too much TV. (extra information)•The man who took the pictures is being sued. (essential)•Cats, more independent than dogs, are good pets. (extra)•Cats who are fussy eaters are a challenge. (essential)2.18Commas with AppositivesAnappositiverenames or identifies a noun.Nonrestrictive appositives are enclosed in commas.Examples:•Kublai Khan, grandson of Genghis, ruled China.•Jack Kerouac, a Beat Generation writer, became famous.Restrictive appositives are essential and do not use commas.

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Study GuideCorrect:•Shakespeare’s playHamletwas written around 1600.Incorrect:•Shakespeare’s play,Hamlet, was written around 1600.2.19Commas in a Series (The Serial Comma)Commas separate items in a list. Using a comma before the finalandis called theserial comma.Example:•Red, white, and blueUsing the serial comma is clearer and avoids confusion. Many writers choose to use it consistently.Examples:•He bought a dishwasher, microwave, refrigerator, and washer.•The recipe calls for flour, sugar, eggs, and milk.Without the final comma, meanings can become unclear.2.20When Not to Use Commas in a SeriesDo not use commas if all items are joined byandoror.Correct:•He asked to see Martha and Helen and Eileen.Incorrect:•He asked to see Martha, and Helen, and Eileen.2.21Commas Between ModifiersUse commas between adjectives that equally describe a noun.Example:•It was a dark, gloomy, forbidding house.

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Study GuideDo not place a comma between the last adjective and the noun it directly modifies.Correct:•a beautiful, spacious summer home2.22The Adjective TestTry reversing the adjectives:•If the sentence still makes sense, use commas.•If it does not, don’t.Example:•dark, gloomy, forbidding → works•spacious summer → does not2.23Commas with Quotation MarksCommas always goinsidequotation marks.Examples:•He called her “the worst boss in the world,” and quit.•“I can’t believe you ate it,” she said.2.24Miscellaneous Uses of CommasUse commas in these situations:•With dialogue tagsoHe said, “Let’s go.”•In dates and addressesoDecember 10, 1962o1328 Sailor Road, Santa Paula, CA 93060•Between locationsoBoise, Idaho

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