Learn on PengiElements of Language, 5th CourseChapter 13: Punctuation: End Marks and Commas

Lesson 2: Commas with Items in a Series, Independent Clauses, and Nonessential Clauses and Phrases

In this Grade 8 grammar lesson from Elements of Language, 5th Course, students learn the rules for using commas with items in a series, two or more adjectives before a noun, independent clauses joined by coordinating conjunctions, and nonessential clauses and phrases. The lesson covers key distinctions, such as when to omit commas in a series connected by and, or, or nor, and how to tell an adverb-adjective pair from two coordinate adjectives. Practice exercises reinforce correct comma placement across a variety of sentence types found in Chapter 13.

Section 1

Commas with Items in a Series

Definition

Use commas to separate items in a series.

Explanation

Think of commas as little pauses between items in a list. When you list three or more things, like nouns, verbs, or phrases, you need commas to keep them organized. It's like building a fence! However, if you use and or or between every single item in the series, you can skip the commas.

Examples

  • The cat leaped onto the counter, along the shelf, and into the sink. [Each phrase is a separate item, so commas separate them.]
  • My recipe requires flour, sugar, eggs, and butter. [Each noun in the list is a separate item, so commas separate them.]
  • She read and studied and practiced for the exam. [The items in the series are all joined by 'and', so commas are not needed.]

Section 2

Commas with Multiple Adjectives

Definition

Use commas to separate two or more adjectives before a noun.

Explanation

When you pile up adjectives to describe a noun, use commas to separate them for clarity. But watch out! If one word is an adverb modifying an adjective right next to it, like 'very cold' or 'light blue', do not use a comma. The adverb is part of the adjective's description.

Examples

  • The loud, energetic, happy puppy is a golden retriever. [Commas separate each adjective describing the noun 'puppy'.]
  • He is a brave, loyal friend. [Two adjectives precede the noun 'friend' and are separated by a comma.]
  • We saw the bright red car speed away. [In this sentence, 'bright' is an adverb that modifies the adjective 'red'. No comma should separate them.]

Section 3

Commas with Independent Clauses

Definition

Use a comma before a coordinating conjunction (and, but, for, nor, or, so, or yet) when it joins independent clauses.

Explanation

An independent clause is a complete thought with its own subject and verb. When you connect two of these clauses with a joining word like and, but, or so, place a comma before the conjunction. Don't confuse this with a simple sentence that just has one subject performing two actions (a compound verb).

Examples

  • The bus was late, so Maria decided to walk. [A comma and the coordinating conjunction 'so' join two independent clauses.]
  • I wanted to play soccer, but my friends wanted to go swimming. [A comma and the coordinating conjunction 'but' join two independent clauses.]
  • Alex baked cookies and decorated the cake. [This simple sentence has one subject and a compound verb, so no comma is needed.]

Section 4

Commas with Nonessential Clauses

Definition

Use commas to set off nonessential subordinate clauses and nonessential participial phrases.

Explanation

A nonessential clause is 'extra' information; the sentence's main idea is clear without it. You must 'set off' this bonus detail with commas. An essential clause contains crucial information that tells you which one we're talking about, so it does not get commas. It's too important to be set apart!

Examples

  • My cousin, who lives in Texas, is visiting next week. [The subordinate clause is nonessential. Commas separate the clause from the basic information in the sentence.]
  • The student who won the science fair received a scholarship. [The subordinate clause is essential because it identifies which student received the scholarship. No commas are needed.]

Section 5

Commas with Nonessential Phrases

Definition

Use commas to set off nonessential subordinate clauses and nonessential participial phrases.

Explanation

A participial phrase, which often starts with an '-ing' or '-ed' verb form, acts like an adjective. If the phrase just adds extra information, it's nonessential and should be surrounded by commas. If the phrase is needed to identify which noun you mean, it is essential and uses no commas.

Examples

  • The mail carrier, whistling a cheerful tune, delivered our packages. [The participial phrase 'whistling a cheerful tune' is nonessential. Commas separate the phrase from the basic information in the sentence.]
  • The bike parked by the fence has a flat tire. [The participial phrase 'parked by the fence' is essential to understanding which bike has a flat tire. No commas are needed.]

Book overview

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Chapter 13: Punctuation: End Marks and Commas

  1. Lesson 1

    Lesson 1: End Marks and Abbreviations

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  2. Lesson 2Current

    Lesson 2: Commas with Items in a Series, Independent Clauses, and Nonessential Clauses and Phrases

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  3. Lesson 3

    Lesson 3: Commas with Introductory Elements, Interrupters, and in Conventional Situations

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Lesson overview

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Section 1

Commas with Items in a Series

Definition

Use commas to separate items in a series.

Explanation

Think of commas as little pauses between items in a list. When you list three or more things, like nouns, verbs, or phrases, you need commas to keep them organized. It's like building a fence! However, if you use and or or between every single item in the series, you can skip the commas.

Examples

  • The cat leaped onto the counter, along the shelf, and into the sink. [Each phrase is a separate item, so commas separate them.]
  • My recipe requires flour, sugar, eggs, and butter. [Each noun in the list is a separate item, so commas separate them.]
  • She read and studied and practiced for the exam. [The items in the series are all joined by 'and', so commas are not needed.]

Section 2

Commas with Multiple Adjectives

Definition

Use commas to separate two or more adjectives before a noun.

Explanation

When you pile up adjectives to describe a noun, use commas to separate them for clarity. But watch out! If one word is an adverb modifying an adjective right next to it, like 'very cold' or 'light blue', do not use a comma. The adverb is part of the adjective's description.

Examples

  • The loud, energetic, happy puppy is a golden retriever. [Commas separate each adjective describing the noun 'puppy'.]
  • He is a brave, loyal friend. [Two adjectives precede the noun 'friend' and are separated by a comma.]
  • We saw the bright red car speed away. [In this sentence, 'bright' is an adverb that modifies the adjective 'red'. No comma should separate them.]

Section 3

Commas with Independent Clauses

Definition

Use a comma before a coordinating conjunction (and, but, for, nor, or, so, or yet) when it joins independent clauses.

Explanation

An independent clause is a complete thought with its own subject and verb. When you connect two of these clauses with a joining word like and, but, or so, place a comma before the conjunction. Don't confuse this with a simple sentence that just has one subject performing two actions (a compound verb).

Examples

  • The bus was late, so Maria decided to walk. [A comma and the coordinating conjunction 'so' join two independent clauses.]
  • I wanted to play soccer, but my friends wanted to go swimming. [A comma and the coordinating conjunction 'but' join two independent clauses.]
  • Alex baked cookies and decorated the cake. [This simple sentence has one subject and a compound verb, so no comma is needed.]

Section 4

Commas with Nonessential Clauses

Definition

Use commas to set off nonessential subordinate clauses and nonessential participial phrases.

Explanation

A nonessential clause is 'extra' information; the sentence's main idea is clear without it. You must 'set off' this bonus detail with commas. An essential clause contains crucial information that tells you which one we're talking about, so it does not get commas. It's too important to be set apart!

Examples

  • My cousin, who lives in Texas, is visiting next week. [The subordinate clause is nonessential. Commas separate the clause from the basic information in the sentence.]
  • The student who won the science fair received a scholarship. [The subordinate clause is essential because it identifies which student received the scholarship. No commas are needed.]

Section 5

Commas with Nonessential Phrases

Definition

Use commas to set off nonessential subordinate clauses and nonessential participial phrases.

Explanation

A participial phrase, which often starts with an '-ing' or '-ed' verb form, acts like an adjective. If the phrase just adds extra information, it's nonessential and should be surrounded by commas. If the phrase is needed to identify which noun you mean, it is essential and uses no commas.

Examples

  • The mail carrier, whistling a cheerful tune, delivered our packages. [The participial phrase 'whistling a cheerful tune' is nonessential. Commas separate the phrase from the basic information in the sentence.]
  • The bike parked by the fence has a flat tire. [The participial phrase 'parked by the fence' is essential to understanding which bike has a flat tire. No commas are needed.]

Book overview

Jump across lessons in the current chapter without opening the full course modal.

Continue this chapter

Chapter 13: Punctuation: End Marks and Commas

  1. Lesson 1

    Lesson 1: End Marks and Abbreviations

    LearnPractice
  2. Lesson 2Current

    Lesson 2: Commas with Items in a Series, Independent Clauses, and Nonessential Clauses and Phrases

    LearnPractice
  3. Lesson 3

    Lesson 3: Commas with Introductory Elements, Interrupters, and in Conventional Situations

    LearnPractice