Punctuations - Introduction and Rules, Part 1, Verbal Aptitude | Verbal Ability & Reading Comprehension (VARC) - CAT PDF Download

Spacing with Punctuation

Proper punctuation and spacing improve readability and prevent ambiguity. Below are practical, standard rules to follow when typing or editing English prose.

1. Rule 1

   When typing on a computer, use only one space after periods, commas, semicolons, colons, exclamation points, question marks, and quotation marks. Most modern typesetting and word‑processing systems adjust inter‑sentence spacing automatically.

2. Rule 2

   Do not use spaces on either side of a hyphen.

   Example: We borrowed twenty-three sheets of paper.

Periods

1. Rule 1

   Use a period at the end of a complete declarative sentence.

   Example: I know him well.

2. Rule 2

   If the last item in a sentence is an abbreviation that already ends with a period, do not add another period after it.

   Incorrect: This is Alice Smith, M.D..

   Correct: This is Alice Smith, M.D.

   Correct: Please shop, cook, etc. We will do the laundry.

3. Rule 3

   A question mark or an exclamation point replaces the period at the end of a sentence when appropriate; do not use both a period and one of these marks.

Commas

Commas and periods are the most frequently used punctuation marks. Commas indicate short pauses and are less final than periods. The rules below address common situations where commas are required or optional.

Definitions and useful terms

• Independent clause: a clause that can stand alone as a complete sentence (has subject + verb + complete thought).
• Dependent (subordinate) clause: a clause that cannot stand alone and depends on the main clause for meaning.
• Appositive: a noun or noun phrase that renames or gives additional information about a nearby noun (often set off by commas when nonessential).
• Comma splice / run-on sentence: the incorrect joining of two independent clauses with only a comma.

Rules

1. Rule 1

   Use commas to separate words and word groups in a simple series of three or more items.

   Example: My estate goes to my husband, son, daughter-in-law, and nephew.

   Note: The last comma in the series before and or or (Oxford comma) can be important for clarity. While some styles omit it, include it when omission causes ambiguity.

   Example: We had coffee, cheese and crackers and grapes.

   Adding the Oxford comma clarifies that cheese and crackers is one item:

   We had coffee, cheese and crackers, and grapes.

   Fiction and formal nonfiction usually prefer the Oxford comma. Writers should be consistent in its use, except when omission causes confusion.

2. Rule 2

   Use a comma to separate two coordinate adjectives (adjectives whose order can be switched and still make sense).

   Example: He is a strong, healthy man.

   You can say healthy, strong man, so a comma is needed.

   Example: We stayed at an expensive summer resort.

   You would not say summer expensive resort, so no comma is required.

   A simple test: insert and between the adjectives. If the phrase still makes sense, use a comma.

3. Rule 3a

   Many writers incorrectly join two independent clauses with only a comma, producing a comma splice or run‑on sentence.

   Incorrect: He walked all the way home, he shut the door.

   Simple corrections are:

   Correct: He walked all the way home. He shut the door.

   Correct: After he walked all the way home, he shut the door.

   Correct: He walked all the way home, and he shut the door.

4. Rule 3b

   When two independent clauses are joined by coordinating conjunctions such as and, or, but, place a comma before the conjunction.

   Incorrect: He walked all the way home and he shut the door.

   Correct: He walked all the way home, and he shut the door.

   Some writers omit the comma when both clauses are very short:

   Example: I paint and he writes.

5. Rule 3c

   If the subject is not repeated before the second verb, a comma is generally unnecessary.

   Example: He thought quickly but still did not answer correctly.

   However, a comma may be necessary to avoid ambiguity.

   Confusing: I saw that she was busy and prepared to leave.

   Clearer with comma: I saw that she was busy, and prepared to leave.

   Without the comma, the reader might think she (not the speaker) was prepared to leave.

6. Rule 4a

   When a sentence begins with a dependent clause or with an introductory phrase, use a comma after it.

   Example: If you are not sure about this, let me know now.

   Example: Having finally arrived in town, we went shopping.

   If the introductory phrase is short (three or four words), the comma may be optional.

   Example: When in town we go shopping.

   Always use a comma if it prevents a misreading:

   Example: Last Sunday, evening classes were cancelled.

   When an introductory phrase begins with a preposition, a comma may not be necessary even if it is longer than three or four words.

   Example: Into the sparkling crystal ball he gazed.

   If such a phrase contains more than one prepositional element, a comma may be used unless the verb immediately follows the phrase.

   Examples:

   Between your house on Main Street and my house on Grand Avenue, the mayor's mansion stands proudly.

   Between your house on Main Street and my house on Grand Avenue is the mayor's mansion.

7. Rule 4b

   Usually no comma is needed when a sentence starts with an independent clause followed by a dependent clause.

   Example: Let me know now if you are not sure about this.

8. Rule 5

   Use commas to set off nonessential words, clauses, and phrases (see who, that, which distinctions).

   Incorrect: Jill who is my sister shut the door.

   Correct: Jill, who is my sister, shut the door.

   Incorrect: The man knowing it was late hurried home.

   Correct: The man, knowing it was late, hurried home.

   Nonessential mid-sentence words, phrases, or clauses must be enclosed by commas. The closing comma after the nonessential element is called an appositive comma.

   Examples requiring an appositive comma with one or more nouns:

   Incorrect: My best friend, Joe arrived.

   Correct: My best friend, Joe, arrived.

   Incorrect: The three items, a book, a pen, and paper were on the table.

   Correct: The three items, a book, a pen, and paper, were on the table.

9. Rule 6

   If a person or thing is clearly identified, the following description is nonessential and should be enclosed in commas. If the description is essential to identify the person or thing, do not use commas.

   Examples:

   Freddy, who has a limp, was in an auto accident.

   We already know which Freddy is meant, so the description is nonessential.

   The boy who has a limp was in an auto accident.

   We do not know which boy is meant, so no commas are used.

   This distinction often causes confusion. Compare:

   Example: My brother Bill is here.

   Now add commas and note the change:

   Example: My brother, Bill, is here.

   The first sentence implies more than one brother; the second means Bill is the only brother.

   Misusing commas can produce misleading meanings:

   Example: Mark Twain's book, Tom Sawyer, is a delight.

   The commas wrongly imply Twain wrote only one book.

10. Rule 7a

    Use a comma after certain introductory words such as well, yes, why, hello, hey when they begin a sentence.

    Examples:

    Why, I can’t believe this!

    No, you can’t have a dollar.

11. Rule 7b

    Use commas to set off expressions that interrupt sentence flow: nevertheless, after all, by the way, on the other hand, however, etc.

    Example: I am, by the way, very nervous about this.

12. Rule 8

    Use commas to set off the name, nickname, term of endearment, or title of the person being directly addressed (vocative commas).

    Examples:

    Will you, Aisha, do that assignment for me?

    Yes, old friend, I will.

    Good day, Captain.

13. Rule 9

    Use a comma to separate the day of the month from the year, and place a comma after the year when the date occurs mid‑sentence.

    Example: It was in the Sun's June 5, 2003, edition.

    No comma is needed when only month and year are given:

    Example: It was in a June 2003 article.

14. Rule 10

    Use a comma to separate a city from its state or region, and place a comma after the state if the phrase continues.

    Example: I'm from the Akron, Ohio, area.

15. Rule 11

    Traditionally, when a name is followed by Sr. or Jr., a comma follows the last name: Martin Luther King, Jr. The first comma is optional; if used, a second comma must follow when the full name appears mid‑sentence.

    Correct: Al Mooney Sr. is here.

    Correct: Al Mooney, Sr., is here.

    Incorrect: Al Mooney, Sr. is here.

16. Rule 12

    Use commas to enclose degrees, professional titles, or other postnominal abbreviations that follow a name.

    Example: Al Mooney, M.D., is here.

17. Rule 13a

    Use commas to introduce or interrupt direct quotations when they are integrated into the sentence.

    Examples:

    He said, "I don't care."

    "Why," I asked, "don't you care?"

    This rule is optional for single‑word quotations that function as isolated words.

    Example: He said "Stop."

18. Rule 13b

    If the quotation precedes a reporting clause such as he said, she wrote, they reported, Dana insisted, end the quotation with a comma (unless the quotation itself ends with a question mark or exclamation mark).

    Examples:

    "I don't care," he said.

    "Stop," he said.

19. Rule 13c

    If a quotation functions as the subject or object of a sentence, a comma may not be necessary.

    Examples:

    Is "I don't care" all you can say to me?

    Saying "Stop the car" was a mistake.

20. Rule 13d

    If a quoted question ends mid‑sentence, the question mark replaces a comma.

    Example: "Will you still be my friend?" she asked.

21. Rule 14

    Use a comma to separate a statement from a following short question (tag or short interrogative).

    Example: I can go, can't I?

22. Rule 15

    Use a comma to separate contrasting parts of a sentence.

    Example: That is my money, not yours.

23. Rule 16a

    Use a comma before and after certain introductory words or expressions such as namely, that is, i.e., e.g., for instance when followed by a series or explanation.

    Example: You may be required to bring many items, e.g., sleeping bags, pans, and warm clothing.

24. Rule 16b

    Place a comma before etc. Many editors also recommend a comma after etc. when it occurs mid‑sentence.

    Example: Sleeping bags, pans, warm clothing, etc., are in the tent.

Practical notes and common pitfalls

• Be consistent with the Oxford comma in a given document or publication. When in doubt, use the comma to avoid ambiguity.
• Do not rely solely on length to decide whether to insert a comma after introductory material; consider clarity first.
• When in doubt about whether a clause is essential or nonessential, test whether removing the clause changes the meaning needed to identify the noun. If yes, it is essential (no commas); if no, it is nonessential (use commas).
• Avoid comma splices by choosing one of the correct fixes: period, semicolon, conjunction with comma, or rephrasing.
• Commas do not replace stronger punctuation where a stronger break is required (use a period, semicolon, or em dash as appropriate).

Quick reference checklist

• One space after sentence punctuation; no spaces around hyphens.
• Use periods for declaratives; do not double periods after abbreviations.
• Use commas for series, coordinate adjectives, clauses, appositives, dates, places, direct-address names, and many introductory or interrupting elements.
• Place a comma before coordinating conjunctions joining independent clauses.
• Use commas to set off nonessential information; omit them for essential information that identifies.
• Use commas with quotations and reporting clauses according to position and function of the quotation.