English Language Arts
Grade 9
15 min
Commas with compound and complex sentences
Commas with compound and complex sentences
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1
Introduction & Learning Objectives
Learning Objectives
Correctly identify independent and dependent clauses within a sentence.
Differentiate between a compound sentence and a complex sentence based on their structure.
Apply the comma rule for joining two independent clauses with a coordinating conjunction.
By the end of of this lesson, students will be able to apply the comma rule for introductory dependent clauses in complex sentences.
Recognize when a comma is not needed in a complex sentence.
Revise their own writing to correct comma splices and other common errors in compound and complex sentences.
Did you know a single comma can be the difference between a friendly invitation and a terrifying suggestion? 👵 'Let's eat, Grandma!' vs. 'Let's eat Grandma!'
Mastering commas in...
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Key Concepts & Vocabulary
TermDefinitionExample
Independent ClauseA group of words that contains a subject and a verb and expresses a complete thought. It can stand alone as a sentence.The author presents a compelling argument.
Dependent (or Subordinate) ClauseA group of words that contains a subject and a verb but does not express a complete thought. It cannot stand alone as a sentence and often begins with a subordinating conjunction.Although the author presents a compelling argument...
Coordinating Conjunction (FANBOYS)A word that connects words, phrases, or clauses of equal rank. The seven coordinating conjunctions are For, And, Nor, But, Or, Yet, and So.The theme is complex, but the author explains it well.
Subordinating ConjunctionA word that begins a dependent clause and connects it to an independent clause...
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Key Rules & Conventions
The Compound Sentence Formula
Independent Clause + , + FANBOYS + Independent Clause.
Use a comma before a coordinating conjunction (For, And, Nor, But, Or, Yet, So) when it joins two complete sentences (independent clauses). This comma signals to the reader that a new, complete thought is beginning.
The Introductory Dependent Clause Rule
Dependent Clause + , + Independent Clause.
When a complex sentence begins with a dependent clause (often starting with a word like 'although,' 'because,' 'since,' or 'when'), place a comma after the entire dependent clause, just before the independent clause begins.
The Terminal Dependent Clause Rule (No Comma!)
Independent Clause + (no comma) + Dependent Clause.
When a dependent clause comes a...
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Challenging
A student's thesis is: 'The poet's use of metaphor is effective, it creates a somber mood.' Which of the following revisions most effectively corrects the comma splice while maintaining a sophisticated academic tone?
A.The poet's use of metaphor is effective and it creates a somber mood.
B.The poet's use of metaphor is effective. It creates a somber mood.
C.The poet's use of metaphor is effective, for it creates a somber mood.
D.Because the poet's use of metaphor is effective, it creates a somber mood.
Challenging
Analyze the following sentence: 'When the author reveals the twist, the reader is shocked, so the preceding chapters must be re-evaluated.' How should this sentence be classified and is it punctuated correctly?
A.It is a correctly punctuated complex-compound sentence.
B.It is a complex sentence with a comma splice.
C.It is a compound sentence with an unnecessary introductory clause.
D.It is a complex-compound sentence, but the comma after 'shocked' should be a semicolon.
Challenging
Consider this sentence: 'The protagonist is an anti-hero, for his noble goals are achieved through immoral methods.' Which statement best justifies the use of the comma in this sentence?
A.The comma correctly separates an introductory phrase from the main clause.
B.The comma is necessary because the sentence is complex and contains the word 'for'.
C.The comma is used incorrectly; it creates a comma splice between two related ideas.
D.The comma correctly precedes the coordinating conjunction 'for,' which joins two independent clauses.
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