Key Takeaways

  • Formal writing avoids contractions, slang, and casual expressions
  • Third person is generally more formal than first or second person
  • Replace casual words (got, stuff, a lot) with precise formal alternatives
  • Match language formality to context: academic/professional requires formal; personal allows informal
  • Professional tone is respectful, objective, and clear without being stiff or cold
Last updated: January 2026

Formal vs. Informal Language

Understanding when to use formal versus informal language is essential for professional communication. The TEAS tests your ability to recognize appropriate language for different contexts.

Characteristics of Formal and Informal Language

FeatureFormalInformal
ContractionsAvoided (do not, cannot)Common (don't, can't)
VocabularySophisticated, preciseCasual, colloquial
Sentence structureComplex, variedSimple, direct
ToneSerious, professionalConversational, friendly
PronounsThird person preferredFirst/second person common
SlangNeverSometimes acceptable
AbbreviationsSpelled out or formalCommon (info, etc.)

When to Use Formal Language

Formal contexts:

  • Academic papers and research
  • Medical documentation
  • Professional reports
  • Business correspondence
  • Official presentations
  • Legal documents

Formal example: "The patient presented with symptoms consistent with acute respiratory infection. Treatment was initiated per protocol, and the patient demonstrated significant improvement within 48 hours."

When to Use Informal Language

Informal contexts:

  • Personal emails
  • Text messages
  • Casual conversations
  • Social media (personal)
  • Notes to friends/family
  • Informal blogs

Informal example: "The patient came in with a bad cold. We started treatment right away, and he was feeling a lot better in a couple of days."

Avoiding Inappropriate Informality

Informal (Avoid)Formal (Preferred)
kidschildren
a lotnumerous, many
stuffmaterials, items
gotreceived, obtained
kind ofsomewhat, rather
pretty goodsatisfactory, adequate
okayacceptable, approved
fixrepair, correct
figure outdetermine, ascertain
get rid ofeliminate, remove

Avoiding Slang and Jargon

Slang: Highly informal expressions that may not be widely understood

  • ❌ "The patient was feeling sketchy."
  • ✅ "The patient was feeling unwell."

Jargon: Specialized terminology that may confuse general audiences

  • Use medical terminology appropriately for your audience
  • Define technical terms when writing for general readers

Contractions in Formal Writing

AvoidUse Instead
don'tdo not
can'tcannot
won'twill not
shouldn'tshould not
it'sit is
they'rethey are

Exception: Contractions may appear in direct quotations in formal writing.

First, Second, and Third Person

PersonPronounsFormality
FirstI, we, me, usLess formal
Secondyou, yourLeast formal
Thirdhe, she, it, they, oneMost formal

Academic/professional preference: Third person is often preferred for objectivity.

  • Less formal: "I observed that the patient improved."
  • More formal: "The patient demonstrated improvement."

Passive vs. Active Voice

VoiceExampleUse
ActiveThe nurse administered the medication.Clear, direct
PassiveThe medication was administered by the nurse.More formal, emphasizes action

Note: Active voice is generally preferred for clarity, but passive voice is common in formal scientific writing.

Tone in Professional Communication

Elements of professional tone:

  • Respectful and courteous
  • Objective and unbiased
  • Clear and precise
  • Confident but not arrogant
  • Positive when possible

Avoid:

  • Emotional language
  • Sarcasm or humor (in formal contexts)
  • Accusatory statements
  • Overly casual expressions

Adapting Language to Audience

Consider:

  • Who will read this?
  • What is the purpose?
  • What is the context?
  • What are the expectations?

Example adaptations:

AudienceStyle
Medical colleaguesTechnical, formal, use medical terminology
PatientsClear, simple, explain medical terms
General publicAccessible, define jargon
SuperiorsFormal, professional, complete sentences
Test Your Knowledge

Which sentence is most appropriate for a formal medical report?

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Test Your Knowledge

Which word would be most appropriate to replace "a lot of" in formal writing?

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D
Test Your Knowledge

Which sentence uses an appropriately formal tone for academic writing?

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B
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D