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🔥 Writing & Speaking

Formal vs Informal English – Learn the Difference & When to Use Each

Formal English follows a structured, polite style used in professional, academic, and respectful situations. Informal English is relaxed, everyday language used with friends, family, and in casual conversations. Knowing when and how to switch between these two styles is essential for advanced English writing and speaking. This comprehensive guide explains the differences, provides examples of formal and informal expressions, and includes an extensive list of formal vs informal words.

What Is Formal English?

Formal English is the style of writing and speaking that follows rules of politeness, proper grammar, and a professional tone. It is typically used:

  • When talking to strangers, respected persons, or superiors.
  • In business letters, official emails, academic writing, job interviews.
  • In essays, newspapers, official documents, and speeches on special occasions.

What Is Informal English?

Informal English is the casual, everyday language used in relaxed settings. It often includes contractions, slang, phrasal verbs, and simpler vocabulary. It is used:

  • When talking with friends, family, or close acquaintances.
  • In personal letters, casual emails, text messages, and everyday conversations.
  • For friendly, spontaneous communication where strict rules aren't necessary.
Key point: Formal English is mostly used in writing. Informal English is mostly used in speaking — but each can appear in both depending on the situation.

Key Differences Between Formal and Informal English

A) Phrasal Verbs

In formal English, single-word verbs are preferred over phrasal verbs, which are more common in informal English.

Formal: He has established a school to educate the children.

Informal: He has set up a school to educate the children.

B) Slang

Slang words and expressions are kept outside formal English. They belong to casual, spoken English.

Formal: How do you do?

Informal: What's up?

C) Contractions

Contractions (like don't, it's, gonna) are rarely used in formal English. They are standard in informal English.

Formal: It is going to be the most interesting journey.

Informal: It's gonna be the most interesting journey.

D) Active vs Passive Voice

It is better to use more passive voice in formal English, while active voice is more common in informal English.

E) Sentence Length and Complexity

Formal English often uses long, complex, or compound sentences. Informal English tends toward short, simple sentences.

Formal: Dr Paul is a renowned and kind person who provides his patients free of cost service.

Informal: It's OK, I'm busy, I'm fine, etc.

F) Complete Sentences vs Fragments

Formal English uses complete sentences. Informal English often uses single words, phrases, and fragments.

Formal: Do you want to go with me?

Informal: Wanna go with me? (Wanna = Want to)

G) Vocabulary Choice

In formal English, use formal words and phrases (entire, commence, require, purchase). Avoid informal ones (whole, start, need, buy) in formal contexts.

Examples of Formal vs Informal Expressions

Comprehensive List of Formal (Informal) Words

Note: Words without brackets are formal; words in brackets are informal equivalents with the same or similar meaning.

Purchase (Buy), Permit (Let), Enter (Come in), Amiable (Friendly), Numerous (A lot of), Anyone (Anybody), Entire (Whole), Repair (Mend), Additional (More), Explode (Blow up), Frequently (Often), Collapse (Break down), Futile (Hopeless), Dispatch (Send), Garment (Dress), Nude (Naked), Prompt (Quick), Wealthy (Rich), Therefore (So), Fortunate (Lucky), Opportunities (Chance), Inexpensive (Cheap), Enormous (Big/Large), Depart (Go), Aid/Assist (Help), Return (Send back), Slight (Small), Obtain (Get), Reside (Live), Request (Ask for), Occur (Happen), Reserve (Book), Verify (Check), Complete (Finish), Receive (Get), Commence (Start/Begin), Combat (Fight), Terminate (End), Inform (Tell), Consume (Eat), Approximately (About), Difficult (Tough), Incorrect (Wrong), Correct (Right), Absent (Away), Insane (Mad), Enquire (Ask), Appear (Seem), Release (Free), Retain (Keep), Children (Kids), Circular (Round), Collect (Pick up), Consider (Think about), Construct (Build), Decrease (Go down), Deficiency (Lack of), Courageous (Brave), Vision (Sight), Require (Need), Repay (Pay back), Indicate (Point out), Discover (Find out), Transparent (Clear), Eliminate (Remove), Experiment (Test), Ill (Sick), Investigate (Look into), Pleased (Happy), Quit (Give up), Senior (Older), Utilize (Use), Sufficient (Enough), Vacant (Empty), A little (A bit), Desire (Want), Accelerate (Speed up), Select (Choose), Tolerate (Put up with), Complete/Entire (Whole), Exhausted/Fatigued (Tired), Garment (Clothes), Humorous (Funny), Continue (Go on), Contaminated (Dirty/Polluted), Repeatedly (Again and again), Father (Dad), Youthful (Young), Increase (Go up), Request (Ask for), Allow (Let), Observe (See), Establish (Set up), Postpone (Put off), Receive (Get), Apologize (Say sorry), Finish (End), Endeavor (Try), Depart (Go), Fearful (Afraid), Connect (Link-up), Demonstrate (Show), Discuss (Talk about), Finally (In the end), Initially (At first), Anticipate (Expect), Ascend (Climb), Donate (Give), Examine (Go through), Leave (Go away), Immediately (At once), Principally (Mainly), Oppose (Go against), Perhaps (Maybe), By means of (By resemble), Occupation (Job), Employer (Boss), Obtain (Get), Seek (Look for), Haste (Hurry), Amusing (Funny), Inferior (Worse), Proceed (Go ahead), Relaxed (Laid back).

Sample Formal Speech / Writing

Nowadays, the online education system is growing rapidly throughout the entire world because of the rapid advancement of technology. Almost everything is available on the internet, of which most are free content and some are paid. The Internet has brought the entire world into a single room or in a single device like a mobile or a computer.

Sample Informal Speech / Writing

Hey James, What's up? / What's going on? I'm very happy today. I'm gonna tell you some secrets about my life. D'you really wanna know? (D'you = Do You)

⚠️ Important: Sometimes we use informal words and expressions in formal situations out of habit. As an advanced English learner, try to avoid using informal English in formal speech and writing. Learning formal English is essential for advanced writing.

English is a language just like your mother tongue. Mastering the difference between formal and informal English will make you a more versatile and effective communicator. Practise switching between styles depending on your audience and purpose.

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