How to Write an Email in English: Formal and Informal

Introduction

Writing an email in English can feel tricky, especially when you need to decide between a formal or informal tone. Whether you are writing to your boss, a client, a friend, or a family member, choosing the right style makes a big difference. In this post, you will learn the key rules, common phrases, and practical examples for both formal and informal emails.

What Is Formal and Informal Email Writing?

Formal email writing is used in professional, academic, or official situations. It follows standard grammar rules, avoids slang, and uses polite, respectful language. Informal email writing is used with people you know well, such as friends, close colleagues, or family. It allows contractions, casual expressions, and even emojis in some cases. Understanding the difference helps you communicate clearly and appropriately.

Rules for Writing Formal and Informal Emails

1. Know your audience. Ask yourself: Is this person my boss, a client, or a stranger? If yes, use formal language. Is this my friend or sibling? If yes, informal is fine.
2. Use appropriate greetings. Formal: “Dear Mr. Smith,” or “Dear Hiring Manager,”. Informal: “Hi John,” or “Hey Maria,”.
3. Choose correct vocabulary. Formal: “I would like to inquire about…” Informal: “Can you tell me about…”
4. Keep sentence structure clear. Formal emails avoid contractions (do not use “don’t” or “can’t”). Informal emails often use contractions and shorter sentences.
5. Sign off politely. Formal: “Yours sincerely,” or “Best regards,”. Informal: “Cheers,” or “Talk soon,”.
6. Check tone and politeness. Formal emails use “please,” “thank you,” and “would you mind.” Informal emails can be more direct.
7. Proofread carefully. Formal emails must have zero spelling or grammar errors. Informal emails can be a little looser, but still clear.

How to Write a Formal Email (Step-by-Step)

Follow these steps for a professional, clear formal email:

• Step 1: Use a clear subject line. Example: “Application for Marketing Internship – John Doe”
• Step 2: Start with a formal greeting. “Dear Professor Johnson,” or “Dear Sir or Madam,”
• Step 3: State your purpose clearly. “I am writing to apply for the position of…”
• Step 4: Provide necessary details. Include dates, names, or reference numbers when needed.
• Step 5: Use polite requests. “Could you please send me the report by Friday?”
• Step 6: Close with a formal sign-off. “Yours faithfully,” (if you don’t know the name) or “Yours sincerely,” (if you do).

How to Write an Informal Email (Step-by-Step)

• Step 1: Use a casual subject line. Example: “Catch up this weekend?”
• Step 2: Start with a friendly greeting. “Hi Sarah,” or “Hey Tom,”
• Step 3: Write naturally, like speaking. “How are you? I wanted to ask if you’re free on Saturday.”
• Step 4: Use contractions and everyday words. “I’ll bring snacks if you bring drinks.”
• Step 5: Close warmly. “See you soon,” “Take care,” or “Love,” (for close friends/family).

Examples in Sentences (Formal and Informal)

• Formal: “I would like to request an extension for the project deadline.”
• Informal: “Can I get a few more days for the project?”
• Formal: “Please find attached the document you requested.”
• Informal: “I’ve attached the file you asked for.”
• Formal: “We apologize for any inconvenience caused.”
• Informal: “Sorry for the trouble.”
• Formal: “I look forward to hearing from you.”
• Informal: “Let me know what you think.”
• Formal: “Could you kindly confirm your attendance?”
• Informal: “Can you let me know if you’re coming?”

Common Mistakes in Email Writing

• ❌ Using informal greetings in formal emails. “Hey Bob,” for a job application.
  ✅ “Dear Mr. Johnson,” or “Dear Hiring Manager,”
• ❌ Using slang or emojis in formal emails. “Thx for the info! 😊”
  ✅ “Thank you for providing the information.”
• ❌ Forgetting a subject line. Leaving it blank looks unprofessional.
  ✅ Always write a clear subject line.
• ❌ Using “I want” instead of polite requests in formal emails. “I want you to send the report.”
  ✅ “Could you please send the report?”
• ❌ Using overly formal language with friends. “I would like to inquire if you are available for dinner.”
  ✅ “Want to grab dinner tonight?”

Quick Summary

• Formal emails: Use “Dear,” no contractions, polite vocabulary, and a professional sign-off.
• Informal emails: Use “Hi” or “Hey,” contractions, casual words, and a friendly sign-off.
• Always match your tone to your reader. When in doubt, choose formal.
• Proofread – especially in formal writing.
• Subject lines matter – make them clear and relevant.

Practice Exercises

Fill in the blanks with the correct formal or informal expression.

1. ________ (Formal greeting) Mr. Thompson,
2. I ________ (formal: want/request) to apply for the position of Sales Assistant.
3. ________ (Informal greeting) Lisa, how’s it going?
4. Could you please ________ (formal: send/forward) the invoice by Friday?
5. Let me know if you ________ (informal: require/need) any help.

Answers: 1. Dear, 2. request, 3. Hi/Hey, 4. send, 5. need

Conclusion

Knowing how to write formal and informal emails in English is an essential skill for both work and daily life. Remember to always consider your audience and choose the right tone. With practice, you will feel confident writing any email, from a job application to a quick message to a friend.

FAQ

1. Can I use contractions in formal emails?

No, it is best to avoid contractions like “don’t” or “can’t” in formal emails. Use full forms such as “do not” and “cannot” to maintain a professional tone.

2. What should I write in the subject line of a formal email?

Keep it clear and specific. For example: “Application for Web Developer Position – Anna Lee” or “Meeting Request: Project Update – March 15”. Avoid vague subjects like “Hello” or “Question”.

3. Is it okay to use emojis in informal emails?

Yes, emojis are acceptable in informal emails with friends or close colleagues. However, avoid them in any professional or formal context, as they can seem unprofessional.

4. How do I end a formal email if I don’t know the recipient’s name?

Use “Yours faithfully,” at the end. If you know the name, use “Yours sincerely,”. For less formal but still professional emails, “Best regards,” or “Kind regards,” are safe choices.