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Purdue University Globle
CS212 Communicating Professionalism
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Strong written English requires more than correct grammar. Effective writing combines clear sentence structure, appropriate word choice, logical reasoning, and persuasive communication. For CS212 Unit 7, understanding clauses, phrases, conjunctions, modifiers, prepositions, rhetorical appeals, and logical fallacies can help students write clearer academic and professional content while evaluating arguments more critically.
Logical fallacies are especially important because they can make an argument appear convincing even when the reasoning or evidence is weak. Learning to recognize these errors helps writers develop stronger arguments and helps readers distinguish reliable reasoning from misleading claims.
Written communication is most effective when ideas are organized clearly and supported by appropriate evidence. Grammar provides the structure for sentences, while logical reasoning helps writers connect ideas in a meaningful way.
Strong written English skills can help writers:
Construct clear and grammatically correct sentences.
Organize ideas logically.
Present evidence and arguments more effectively.
Avoid misleading or unsupported reasoning.
Improve academic and professional communication.
Strengthen reading comprehension and critical-thinking skills.
These skills apply to essays, discussion posts, reports, workplace communication, presentations, and other forms of academic and professional writing.
A logical fallacy is an error in reasoning that can weaken an argument. Fallacies may involve unsupported assumptions, irrelevant information, misleading comparisons, emotional manipulation, or conclusions that do not logically follow from the available evidence.
Recognizing common logical fallacies is an important part of critical thinking because it allows readers to evaluate whether an argument is actually supported by sound reasoning.
An ad hominem fallacy attacks the person presenting an argument instead of addressing the argument itself.
For example, rather than evaluating a scientist’s research findings, someone might dismiss the findings by criticizing the scientist’s personality or character. The personal criticism does not determine whether the research is accurate.
The bandwagon fallacy assumes that an idea must be correct because many people believe or support it.
For example, saying, “Everyone uses this study technique, so it must be the best,” does not provide evidence that the technique is actually effective.
Begging the question occurs when an argument assumes the truth of the claim it is supposed to prove. In other words, the conclusion is effectively repeated as its own evidence.
For example: “This policy is successful because it works effectively.” The statement does not provide independent evidence demonstrating that the policy is successful.
An either-or fallacy, also called a false dilemma, presents only two choices when other reasonable possibilities exist.
For example: “You are either with us or against us.”
Real-world issues are often more complex than two opposing choices, so writers should consider whether additional alternatives exist.
Equivocation occurs when a word or phrase is used with different meanings within the same argument, creating a misleading conclusion.
Writers can avoid equivocation by defining important terms clearly and using them consistently throughout an argument.
A false analogy assumes that two things are sufficiently similar in all relevant respects simply because they share one or more characteristics.
An analogy can be useful for explaining an idea, but it becomes misleading when the similarities do not provide enough support for the conclusion.
A false authority fallacy occurs when someone is treated as an expert even though they do not have relevant knowledge or qualifications in the subject being discussed.
For example, an actor may be well known but does not automatically become a medical authority because of their public status.
The false cause fallacy assumes that one event caused another simply because the events occurred in sequence or were associated with each other.
For example: “I wore my lucky shoes, so our team won the game.”
The fact that the shoes were worn before the victory does not establish that they caused the outcome.
Guilt by association occurs when someone is judged negatively because of their connection with another person, organization, or group.
The actions or beliefs of one individual do not automatically establish the character or behavior of everyone associated with that individual.
A hasty generalization occurs when someone reaches a broad conclusion based on too little evidence or evidence that is not representative.
For example, forming an opinion about an entire population after observing the behavior of only one or two people can lead to an unsupported conclusion.
A non sequitur occurs when a conclusion does not logically follow from the statement or evidence that comes before it.
For example, if someone says, “She received an excellent grade, so she must be the most talented person in the class,” the second claim does not necessarily follow from the first.
Oversimplification reduces a complicated issue to one simple cause, explanation, or solution while ignoring relevant factors.
Many academic, social, scientific, and professional issues involve multiple contributing factors. Effective writing should acknowledge important complexity when it affects the conclusion.
A red herring introduces irrelevant information to distract the audience from the main issue.
For example, if a discussion focuses on whether a company violated a safety policy, changing the subject to the company’s popularity does not address the original question.
The slippery slope fallacy claims that one action will inevitably lead to a chain of increasingly negative consequences without sufficient evidence showing that the sequence will occur.
Writers should distinguish between a possible consequence and a consequence that is genuinely supported by evidence.
A clause is a group of words that contains a subject and a verb. Clauses can be independent or dependent depending on whether they express a complete thought.
Understanding clauses helps writers construct complete sentences and avoid sentence fragments.
An independent clause expresses a complete thought and can stand alone as a sentence.
Examples include:
The pumps failed.
The ship sank.
Many passengers did not notice the collision.
Each example contains a subject and a verb and communicates a complete idea.
A dependent clause, also called a subordinate clause, contains a subject and a verb but cannot stand alone as a complete sentence.
Examples include:
When the ship collided with the iceberg…
If the ship had struck the iceberg head-on…
Because the weather worsened…
These clauses require an independent clause to complete their meaning.
Conjunctions are words that connect words, phrases, or clauses. They help create smoother sentences and show relationships between ideas.
Coordinating conjunctions connect elements that have equal grammatical importance. The seven commonly recognized coordinating conjunctions can be remembered using the acronym FANBOYS:
For
And
Nor
But
Or
Yet
So
For example: “The ship hit the iceberg, but many passengers remained calm.”
Correlative conjunctions work in pairs to connect related elements.
Common examples include:
Both…and
Either…or
Neither…nor
Not only…but also
For example: “The assignment requires both research and critical analysis.”
Subordinating conjunctions introduce dependent clauses and show relationships such as cause, condition, contrast, time, or reason.
Common examples include:
Because
Although
Since
When
While
If
Unless
For example: “Although the weather worsened, the crew continued working.”
A phrase is a group of related words that functions as a unit within a sentence but does not contain both a subject and a verb forming a complete clause.
Examples include:
Through the hull
During the storm
After the collision
Phrases can perform different grammatical functions. Depending on their structure and use, they can function as nouns, adjectives, adverbs, or other sentence elements.
A modifier is a word, phrase, or clause that provides additional information about another word or part of a sentence. Modifiers can make writing more precise by describing qualities, actions, quantities, or circumstances.
Examples include:
The extremely powerful engine.
The carefully written report.
Modifiers should be placed close to the words they describe. Poor modifier placement can create ambiguity or unintentionally change the meaning of a sentence.
A preposition is a word that establishes a relationship between a noun or pronoun and another part of a sentence. Prepositions commonly express relationships involving time, location, direction, movement, or manner.
Common prepositions include:
About
Above
Across
Against
Around
At
Before
Behind
Below
Between
By
During
For
From
In
Into
Near
Of
On
Over
Through
To
Toward
Under
Until
Upon
With
Within
Without
For example, in the sentence “The passengers waited inside the ship,” the preposition “inside” establishes a relationship between the passengers and the ship.
A run-on sentence occurs when two or more independent clauses are incorrectly joined without appropriate punctuation or a coordinating conjunction.
Incorrect:
The ship hit the iceberg, many passengers remained calm.
The sentence contains two independent clauses that have been joined incorrectly.
Correct:
The ship hit the iceberg, but many passengers remained calm.
Other solutions include separating the clauses into two sentences or using an appropriate semicolon.
Correct:
The ship hit the iceberg. Many passengers remained calm.
Avoiding run-on sentences makes academic writing easier to read and helps readers understand the relationship between ideas.
Rhetorical appeals are persuasive techniques writers and speakers use to influence an audience. The three classical rhetorical appeals are ethos, logos, and pathos.
Ethos appeals to credibility, authority, and trust. A writer can establish ethos by demonstrating relevant knowledge, using credible sources, acknowledging limitations, and presenting information responsibly.
For academic writing, citing reliable evidence is one way to strengthen a writer’s credibility.
Logos appeals to logic and reason. It relies on evidence such as facts, statistics, research findings, examples, and logical explanations.
For example, a writer supporting a health policy might use research data and credible statistics to demonstrate why the policy could be effective.
Pathos appeals to emotions. Writers may use stories, vivid descriptions, personal experiences, or emotionally meaningful language to encourage an audience to feel empathy, concern, hope, or urgency.
Effective persuasive writing can combine ethos, logos, and pathos rather than depending entirely on one appeal.
An oxymoron is a figure of speech that combines two apparently contradictory terms to create a distinctive meaning or emphasize an idea.
Common examples include:
Deafening silence
Bittersweet
Living dead
Poor little rich girl
Oxymorons are commonly found in literature, speeches, journalism, and creative writing because the contrast between the words can make an expression memorable.
| Term | Definition |
|---|---|
| Clause | A group of words containing a subject and a verb. |
| Independent Clause | A complete clause that can stand alone as a sentence. |
| Dependent Clause | A clause that cannot stand alone and requires an independent clause. |
| Phrase | A group of related words that functions as a unit but does not form a complete clause. |
| Modifier | A word, phrase, or clause that describes or provides additional information about another element. |
| Preposition | A word that expresses a relationship involving a noun or pronoun and another part of a sentence. |
| Conjunction | A word that connects words, phrases, or clauses. |
| Ethos | A rhetorical appeal based on credibility and trust. |
| Logos | A rhetorical appeal based on logic, reasoning, and evidence. |
| Pathos | A rhetorical appeal based on emotion. |
| Logical Fallacy | An error in reasoning that can weaken an argument. |
| Oxymoron | A figure of speech that combines apparently contradictory terms. |
| Run-on Sentence | An incorrectly joined group of two or more independent clauses. |
A logical fallacy is an error in reasoning that can make an argument misleading or unsupported. Common examples include ad hominem, hasty generalization, false dilemma, red herring, false cause, and slippery slope.
An independent clause expresses a complete thought and can function as a sentence by itself. A dependent clause contains a subject and verb but does not express a complete thought independently.
The three classical rhetorical appeals are ethos, logos, and pathos. Ethos focuses on credibility, logos uses logic and evidence, and pathos appeals to emotions.
Conjunctions connect words, phrases, and clauses. They help writers establish relationships between ideas and create smoother, more cohesive sentences.
A run-on sentence occurs when two or more independent clauses are joined incorrectly. Writers can correct run-on sentences by using appropriate punctuation, conjunctions, or separate sentences.
Recognizing logical fallacies helps readers evaluate arguments critically and identify reasoning that relies on unsupported assumptions, irrelevant information, or misleading conclusions. It also helps writers develop more credible and logically sound arguments.
A clause contains a subject and a verb, while a phrase does not contain both a subject and a verb functioning together as a clause. Both can serve important grammatical roles within a sentence.
Improving written English requires attention to both sentence-level grammar and the overall logic of an argument. Start by identifying the main idea of each paragraph and making sure supporting sentences clearly relate to that idea.
When revising an assignment, check whether sentences contain complete clauses, whether conjunctions are used correctly, and whether modifiers are positioned clearly. It is also useful to examine arguments for logical fallacies and verify that important claims are supported by appropriate evidence.
For persuasive writing, consider whether ethos, logos, and pathos are being used appropriately. A strong academic argument should prioritize credible evidence and logical reasoning while using emotional appeals carefully and purposefully.
CS212 Unit 7 focuses on foundational written English and reasoning skills that support effective academic communication. Understanding sentence structure helps writers produce grammatically correct and readable work, while knowledge of logical fallacies helps them evaluate arguments and avoid weak reasoning.
The most important concepts to remember include:
Clauses contain a subject and a verb.
Independent clauses can stand alone; dependent clauses cannot.
Conjunctions connect words, phrases, and clauses.
Phrases function as sentence units without forming complete clauses.
Modifiers add descriptive or limiting information.
Prepositions show relationships between words and ideas.
Run-on sentences incorrectly join independent clauses.
Ethos appeals to credibility, logos to logic, and pathos to emotion.
Logical fallacies weaken arguments through flawed or misleading reasoning.
Oxymorons combine apparently contradictory terms for emphasis or effect.
Effective written English depends on clear structure, accurate grammar, logical reasoning, and purposeful communication. For CS212 Unit 7, mastering clauses, conjunctions, phrases, modifiers, prepositions, rhetorical appeals, and logical fallacies provides a strong foundation for academic writing and critical thinking.
Understanding these concepts does more than help students identify grammar mistakes. It enables them to communicate ideas clearly, evaluate arguments thoughtfully, recognize misleading reasoning, and develop persuasive writing supported by credible evidence. These skills remain valuable beyond CS212 because they apply to college assignments, professional communication, workplace writing, and everyday decision-making.
American Psychological Association. (2020). Publication manual of the American Psychological Association (7th ed.). American Psychological Association. https://apastyle.apa.org/products/publication-manual-7th-edition
Encyclopaedia Britannica. (n.d.). Rhetoric. https://www.britannica.com/topic/rhetoric
Lunsford, A. A. (2021). The St. Martin’s handbook (9th ed.). Bedford/St. Martin’s. https://www.macmillanlearning.com/
Purdue Online Writing Lab. (n.d.). Grammar. Purdue University. https://owl.purdue.edu/owl/general_writing/grammar/
University of North Carolina at Chapel Hill Writing Center. (n.d.). Fallacies. https://writingcenter.unc.edu/tips-and-tools/fallacies/
