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 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
| Formal | Informal |
| It is hereby notified that... | We want to tell you that... |
| How do you do? | What's up? |
| It is a pleasure to meet you. | Nice to meet you. |
| At your earliest convenience | As soon as you can |
| My opinion is that... | I think that... |
| I regret to inform you that... | I'm sorry to tell you that... |
| I am concerned about... | I'm worried about... |
| Have you seen John? | Seen John? |
| I would like another... | I want another... |
| I agree with you. | You're right. |
| I would like to remind you that... | Don't forget that... |
| I think you might be mistaken. | You are wrong. |
| Excuse me, could you tell me where the shop is? | Hey, where's the shop? |
| I really appreciate your assistance! | Thanks a lot! |
| Could you repeat that, please? | What? / Repeat that. |
| In my opinion... | I think... |
| It is necessary for me to... | I need to... |
| It is recommended that... | I / We recommend that... |
| May I know your name? | Who are you? |
| Please accept our apologies. | We are sorry. |
| He has the ability to... | He can... |
| Could I borrow your pen? | Give me your pen. |
| The plan was implemented. | They put the plan into action. |
| We should rectify the problem. | We should fix the problem. |
| This appeared to be a difficult task. | This seemed to be a tough task. |
| Take / have a seat, please. | Sit down, please. |
| We would like to... | We want to... |
| We consider it... | We think about it... |
| Let me know... | Tell me... |
| This demonstrates... | This shows that... |
| Distinguish them. | Tell the difference between them. |
| How are you doing? | What's going on? |
| I don't think that's such a good idea. | That's a bad idea. |
| Please let us know your requirements. | What do you need / want? |
| I look forward to meeting you next month. | See you next month. |
| Your handwriting is not really up to standard. | Your handwriting is bad. |
| If you require any further assistance from me... | If you need any help from me... |
| I apologize. | I'm sorry. |
| Would you mind not smoking here, please? | Don't smoke here. |
| It is my opinion that... | I think that... |
| I would like to express my gratitude for... | Thanks a million for... |
| No, thanks. | No. |
| This is to inform you that... | I want to let you know that... |
| We hope that you would take... | You need to take... |
| Could you repeat that, please? | Repeat that. |
| I agree with my father. | My father is right. |
| It is necessary to submit... | You need to submit... |
| We apologize for the delay. | We are sorry for the delay. |
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)
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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