You would not wear a suit to a friend's birthday party. You would not wear shorts to a job interview. English works the same way — different situations demand different levels of formality, and using the wrong register makes you sound either stiff or unprofessional.
For Indian English speakers, this is especially tricky. Indian English has its own formality patterns that differ from American and British norms. This guide gives you clear rules, side-by-side comparisons, and real examples so you always know which register to use.
- The difference between formal and informal English with examples
- 30 common phrases compared side by side
- When to use each register at work, in emails, and in social situations
- Common mistakes Indians make when mixing registers
What Are Formal and Informal English?
Register is the level of formality in your language. Think of it as a scale:
- Very Formal: Legal documents, official speeches, academic papers
- Formal: Business emails, presentations, job interviews, meetings with clients
- Semi-Formal: Workplace conversations, Slack messages, emails to colleagues
- Informal: Friends, family, casual social settings, texting
- Very Informal: Close friends, slang, internet language
Most of your daily English falls in the semi-formal to informal range. The key skill is recognizing when to shift up or down.
Why This Matters in India
Indian English has unique characteristics that can cause register mismatches.
Problem 1: Being Too Formal in Casual Settings
Many Indians use overly formal English in casual conversations because that is what schools taught. Saying "I would like to inform you that I shall be arriving late" to a friend sounds robotic. "Hey, I will be a bit late" is natural.
Problem 2: Using Informal English in Professional Contexts
The opposite problem: using "yaar," "na," or very casual phrases in client emails or presentations. "The project is basically done, na" does not work in a client call.
Problem 3: Mixing Registers Within the Same Conversation
"Dear Sir, I wanted to check if you got my message. BTW the report is attached." Mixing "Dear Sir" with "BTW" creates a jarring tone inconsistency.
Side-by-Side Comparison: 30 Common Phrases
Greetings & Openings
| Formal | Informal | When to Use Formal |
|---|---|---|
| Good morning/afternoon. | Hey! / Hi! | Clients, seniors, first meetings |
| How do you do? | What's up? / How's it going? | Very formal introductions |
| It is a pleasure to meet you. | Nice to meet you! | Business events, interviews |
| I hope this email finds you well. | Hey [name], hope you're doing well! | First email to someone new |
| Thank you for your prompt response. | Thanks for getting back so quickly! | Client/vendor communication |
Making Requests
| Formal | Informal | When to Use Formal |
|---|---|---|
| Could you please send me the report? | Can you send me the report? | Seniors, clients |
| I would appreciate it if you could... | Would you mind...? | Written requests, complaints |
| Would it be possible to reschedule? | Can we move the meeting? | External meetings, interviews |
| I kindly request your assistance. | Could you help me out? | Official letters only |
| Please find the attachment below. | Here's the file. | Formal emails |
Giving Opinions
| Formal | Informal | When to Use Formal |
|---|---|---|
| In my opinion, this approach is more effective. | I think this works better. | Presentations, reports |
| I would like to suggest an alternative. | How about we try something else? | Client meetings |
| I respectfully disagree. | I don't really agree with that. | Formal debates, senior discussions |
| From my perspective... | The way I see it... | Reviews, evaluations |
| It would be advisable to... | I'd say we should... | Written recommendations |
Saying No / Declining
| Formal | Informal | When to Use Formal |
|---|---|---|
| I am afraid I will not be able to attend. | Sorry, I can't make it. | Professional invitations |
| Unfortunately, this does not align with our requirements. | This doesn't really work for us. | Vendor/client rejections |
| I regret to inform you that... | Bad news — ... | Formal rejection letters |
| We will have to decline at this time. | We'll have to pass on this one. | Business proposals |
| Thank you, but I must respectfully decline. | Thanks, but I'll skip this time. | Formal invitations |
Closing & Goodbye
| Formal | Informal | When to Use Formal |
|---|---|---|
| Thank you for your time and consideration. | Thanks a lot! | Interviews, proposals |
| I look forward to hearing from you. | Let me know! | Business follow-ups |
| Best regards / Warm regards | Cheers / Talk soon / Thanks! | Professional emails |
| It was a pleasure speaking with you. | Good chat! / Nice talking to you! | First professional meetings |
| Please do not hesitate to reach out. | Feel free to ping me anytime. | Client-facing communication |
Workplace: When to Use Which
Use Formal English When:
- Emailing or speaking with clients and vendors
- In job interviews
- During presentations to leadership
- Writing official documents (proposals, reports, contracts)
- Meeting someone for the first time
- In performance reviews
Use Informal English When:
- Chatting with close colleagues on Slack or WhatsApp
- In casual team meetings (standup, brainstorming)
- At office lunches and social events
- With teammates you know well
- In internal chat messages about routine work
For more workplace-specific phrases, explore our workplace English guides.
Email vs Chat: Register Guide
Email to a Client
Formal: "Dear Mr. Sharma, I hope this email finds you well. Please find attached the revised proposal as discussed. Kindly review it at your convenience and share your feedback. Best regards, [Your Name]"
Same Message on Slack to a Colleague
Informal: "Hey Rahul, attached the updated proposal. Let me know what you think. Thanks!"
The Key Differences
| Feature | Formal Email | Informal Chat |
|---|---|---|
| Greeting | Dear Mr./Ms. [Name] | Hey [First Name] |
| Sentence length | Longer, complete sentences | Short, sometimes fragments |
| Contractions | Avoid (do not, will not) | Use freely (don't, won't) |
| Closing | Best regards, Warm regards | Thanks! / Cheers |
| Tone | Professional, measured | Friendly, direct |
Common Mistakes Indians Make
Practice Exercises
Exercise 1: Register Conversion
Take any formal sentence and convert it to informal, and vice versa. Do 5 per day.
Formal: "I would like to request a meeting at your earliest convenience."
Your informal version: "Can we set up a quick meeting? Let me know when you're free."
Exercise 2: Email Rewrite
Take your last 3 work emails. Were they in the right register? Rewrite any that were too formal or too casual for the audience.
Exercise 3: Role-Play on TalkDrill
Practice two conversations back to back on TalkDrill: a formal client escalation call, then a casual coffee chat with a colleague. Notice how your language changes. This builds register-switching ability.
Exercise 4: Movie Observation
Watch any English movie and note how characters switch registers. Observe how the same character speaks differently to their boss vs their friend. This trains your ear for register differences.
Building vocabulary for both registers takes practice. For structured vocabulary building, explore our dedicated guides.
Social Situations in India
With Elders / In-Laws
In Indian culture, speaking formally with elders is a sign of respect. Use "you" (never "tu/tum" equivalent casualness), complete sentences, and polite phrases. "Would you like some tea?" rather than "Want chai?"
At a Wedding or Family Function
Semi-formal. "It is so nice to see you. How have you been?" is perfect. Avoid very casual language with relatives you do not know well.
With Friends
Fully informal. Slang, contractions, sentence fragments — all fine. "Dude, that movie was insane" is perfectly natural English among friends.
With Your Child's Teacher
Formal to semi-formal. "Thank you for meeting with me. I wanted to discuss [child's name]'s progress." Not "Hey, what's going on with my kid's marks?"