Formal vs Informal English | Intermediate English for IELTS

Intermediate English for IELTS: Formal vs Informal English

Formal and informal English are important in IELTS because the best tone depends on the task, the situation, and the person you are speaking or writing to. In IELTS Writing Task 2, a formal tone is usually best. In Speaking, a natural and polite tone is usually better. In IELTS General Training letters, the tone may be formal, semi-formal, or informal depending on the question.

Before studying this lesson, it is helpful to review English Alphabet and Spelling, Pronunciation Basics, Parts of Speech, Sentence Structure Basics, Subject-Verb Agreement, Countable and Uncountable Nouns, Articles in English, Pronouns for IELTS, Basic Adjectives, Basic Adverbs, Prepositions in English, Present Simple Tense, Present Continuous Tense, Past Simple Tense, Future Forms in English, Present Perfect Tense, Past Continuous Tense, Past Perfect Tense, Modal Verbs, Comparatives and Superlatives, Gerunds and Infinitives, Passive Voice, Reported Speech, Conditional Sentences, Relative Clauses, Conjunctions and Linking Words, Collocations, Phrasal Verbs, Synonyms and Antonyms, and Word Families. These lessons help you build the grammar and vocabulary choices that affect tone.

What is formal English?

Formal English is the style we use in serious, professional, academic, or unfamiliar situations. It is common in essays, reports, official emails, job applications, presentations, and polite requests.

Formal English is often used when:

• you do not know the reader well
• the situation is serious or official
• you are writing academically
• you want to sound respectful and objective

Formal English often includes:

• complete sentences
• polite expressions
• fewer contractions
• precise vocabulary
• neutral or objective tone
• fewer slang expressions

Examples:

• I would like to apply for the position.
• The results indicate a significant increase.
• Could you please send me the document?
• It is important to consider the long-term effects.

What is informal English?

Informal English is the style we use in relaxed, friendly, or personal situations. It is common in conversation, messages to friends, casual emails, and everyday speech.

Informal English is often used when:

• you know the other person well
• the situation is casual
• you are speaking naturally
• you want a friendly tone

Informal English often includes:

• contractions
• short forms
• simple words
• phrasal verbs
• personal expressions
• direct questions

Examples:

• I’d like to apply for the job.
• The numbers went up a lot.
• Can you send me the file?
• It’s important to think about the long-term effects.

Why formal and informal English matter for IELTS

Choosing the right tone can improve your score because it affects task achievement, coherence, lexical resource, and overall communication.

In Writing Task 2, a formal tone is usually expected.

In Writing Task 1 Academic, the tone should also be formal and objective.

In General Training Writing, tone changes depending on the letter:

• formal letter to a company or official
• semi-formal letter to someone you know professionally
• informal letter to a friend

In Speaking, the tone should be natural, clear, and polite rather than overly formal.

Using the wrong tone can make your response sound unnatural.

Formal vs informal: a quick comparison

Formal English

• I am unable to attend the meeting.
• It would be beneficial to invest in education.
• There is a strong possibility that the plan will succeed.
• The government should implement effective policies.

Informal English

• I can’t make it to the meeting.
• It would be good to invest in education.
• There’s a good chance the plan will work.
• The government should put good policies in place.

Key differences between formal and informal English

1) Vocabulary choice

Formal English often uses more precise or academic vocabulary.

• buy → purchase
• help → assist
• ask → inquire
• get → obtain
• use → utilise / use
• show → demonstrate
• need → require
• start → commence

Informal English usually uses simpler, more common words.

2) Contractions

Formal English usually avoids contractions.

• do not
• cannot
• I am
• it is
• they have

Informal English often uses contractions.

• don’t
• can’t
• I’m
• it’s
• they’ve

3) Phrasal verbs

Phrasal verbs are often more common in informal English.

• put off
• find out
• give up
• look after
• come up with

In formal writing, more direct alternatives may be better.

• postpone
• discover
• quit
• care for
• develop

For extra practice, see Phrasal Verbs and Collocations.

4) Sentence length and structure

Formal English often uses longer, more carefully structured sentences.

• Although the evidence is limited, the findings suggest that the policy may still be effective.

Informal English often uses shorter, simpler sentences.

• The evidence is limited, but the policy might still work.

To improve sentence control, review Sentence Structure Basics and Relative Clauses.

5) Pronouns and tone

Formal English often sounds less personal and more objective.

• One should consider the consequences.
• The applicant is expected to provide evidence.

Informal English can be more direct and personal.

• You should think about the results.
• You need to show proof.

6) Linking words

Formal English often uses more structured linking words.

• however
• therefore
• furthermore
• consequently
• in addition

Informal English often uses simpler links.

• but
• so
• also
• because

For more practice, see Conjunctions and Linking Words.

Formal English in IELTS Writing

Formal English is especially important in IELTS Writing Task 2 and Academic Task 1.

Formal style features in IELTS Writing

• use full forms, not contractions
• use precise vocabulary
• avoid slang and casual expressions
• stay objective where possible
• use formal linkers carefully
• avoid overusing phrasal verbs

Example: informal vs formal writing

Informal:

• A lot of people think this is a bad idea.

Formal:

• Many people believe that this is an unwise decision.

Informal:

• The government should do something about it.

Formal:

• The government should take action to address the issue.

Informal:

• More and more students want to study online.

Formal:

• An increasing number of students wish to study online.

Informal English in IELTS Speaking

In IELTS Speaking, a natural tone is usually best. That does not mean slang is always good. It means your answer should sound conversational, clear, and comfortable.

Good speaking style

• natural contractions are fine
• simple words are fine
• phrasal verbs are fine when appropriate
• personal examples sound natural
• direct answers are usually best

Example speaking responses

• I usually hang out with my friends on weekends.
• I’ve been really busy lately, so I haven’t had much free time.
• I’d say my hometown is pretty peaceful.
• I’m not a huge fan of crowded places.

What to avoid in Speaking

• sounding like a written essay
• memorised formal phrases that do not match the question
• slang that may sound unnatural or unclear

Formal and informal English in IELTS General Training letters

Tone is very important in General Training Writing Task 1.

Formal letter

Use formal English when writing to an official, company, manager, landlord, or unfamiliar person.

Example:

• I am writing to enquire about the vacancy advertised on your website.

Semi-formal letter

Use a balanced tone when writing to someone you know in a professional context.

Example:

• I am writing to ask whether you could help me with the project.

Informal letter

Use a relaxed tone when writing to a friend or family member.

Example:

• Just thought I’d drop you a line to let you know what’s happening.

Common formal expressions

• I am writing to inform you that…
• I would like to request…
• Please be advised that…
• It is important to note that…
• I would appreciate it if you could…
• Due to the fact that…
• In addition to this…
• As a result of…
• I strongly believe that…
• It is essential to consider…

Common informal expressions

• I’m writing to tell you that…
• I want to ask…
• Just to let you know…
• It’s worth pointing out that…
• Could you please…
• Because of…
• Also…
• So…
• I think…
• We really need to…

How to sound formal without sounding unnatural

Formal English should be clear, not heavy.

Good formal style

• The proposal may help reduce traffic congestion.
• There is a clear need for better public transport.
• The findings suggest that further research is necessary.

Too formal or awkward

• The aforementioned proposal may be conducive to the mitigation of traffic congestion.

A good IELTS answer should be natural and accurate, not artificially complicated.

How to sound natural without sounding too casual

Informal English should be friendly, not sloppy.

Good informal style

• I’m really interested in this topic.
• I usually take a break after lunch.
• I’m not sure what the answer is, but I can guess.

Too informal or careless

• Yeah, this stuff is kinda weird, you know?

For better natural expression, also review Basic Adjectives and Basic Adverbs.

Common mistakes with formal and informal English

Mistake 1: Using contractions in formal writing

Incorrect:

• It’s important to invest in education.

Better:

• It is important to invest in education.

Mistake 2: Using slang in academic writing

Incorrect:

• The results were kind of weird.

Better:

• The results were surprising / unusual / unexpected.

Mistake 3: Using phrasal verbs when a formal verb is better

Incorrect:

• The government should look into the issue.

Better:

• The government should investigate the issue.

Mistake 4: Using overly complicated vocabulary

Incorrect:

• The situation necessitates immediate amelioration.

Better:

• The situation needs immediate improvement.

Mistake 5: Using the wrong tone for the task

Incorrect:

• Hey, I just wanted to say I’m applying for the job.

Better:

• I am writing to apply for the job.

Mistake 6: Being too formal in speaking

Incorrect:

• I would like to express my opinion regarding this matter.

Better:

• I think…

Mistake 7: Mixing tones in the same paragraph

Incorrect:

• The policy is effective. Anyway, it’s also kinda helpful.

Better:

• The policy is effective and may provide several practical benefits.

Useful Tips for IELTS Students

• Match your tone to the task and audience.
• Use formal English in essays and reports.
• Use natural, polite English in Speaking.
• Use contractions in informal contexts, but avoid them in formal writing.
• Replace casual phrasal verbs with more formal vocabulary when needed.
• Review Modal Verbs to make polite requests and suggestions.
• Review Passive Voice to make writing sound more objective.
• Review Synonyms and Antonyms and Word Families to improve word choice.
• Use Collocations and Conjunctions and Linking Words to make your writing smoother.

Practice: Formal vs informal English

Exercise 1: Choose the better formal option

1. I want to ask about the course.
2. The numbers went up a lot.
3. I can’t attend the meeting.
4. The government should do something about pollution.
5. It’s important to think about this issue.

Exercise 2: Rewrite informally

Rewrite the formal sentence in a more natural informal style.

1. I am writing to enquire about your services.
2. I would like to request further information.
3. It is essential to consider both sides of the argument.
4. The report indicates a significant improvement.
5. I would appreciate it if you could reply soon.

Exercise 3: Identify the tone

Write F for formal and I for informal.

1. I’m just writing to say thanks.
2. There is a strong need for reform.
3. We should look into the problem.
4. Could you please provide the details?
5. I’ve been super busy lately.

Exercise 4: Make your own sentence

Write one formal sentence and one informal sentence about the same idea.

Answer key

Exercise 1 suggested answers

1. I would like to enquire about the course.
2. The numbers increased significantly.
3. I am unable to attend the meeting.
4. The government should take action to address pollution.
5. It is important to consider this issue.

Exercise 2 sample answers

1. I’m writing to ask about your services.
2. Can you give me more information?
3. You need to think about both sides of the argument.
4. The report shows a big improvement.
5. Please reply soon.

Exercise 3 answers

1. I
2. F
3. I
4. F
5. I

Frequently Asked Questions

1) What is the difference between formal and informal English?

Formal English is used in serious, professional, or academic situations. Informal English is used in relaxed, friendly, or everyday situations.

2) Which tone should I use in IELTS Writing Task 2?

Use a formal tone.

3) Which tone should I use in IELTS Speaking?

Use a natural, polite, and conversational tone.

4) Can I use contractions in IELTS?

Yes in Speaking and informal writing, but usually not in formal writing tasks.

5) Are phrasal verbs informal?

Many phrasal verbs are more common in informal English, although some are neutral.

6) Is it wrong to use formal language in Speaking?

Not wrong, but too much formal language can sound unnatural.

7) Should I avoid slang in IELTS?

Yes. Slang is usually not a good choice unless the context is very natural and appropriate in speaking.

8) How can I sound formal in writing?

Use precise vocabulary, full forms, objective language, and clear sentence structure.

9) How can I sound natural in speaking?

Use simple clear words, contractions, and everyday expressions without sounding careless.

10) What is the best way to practise formal vs informal English?

Rewrite the same sentence in both styles and compare the tone.

Formal vs Informal English for IELTS

Formal and informal English are not just about vocabulary. They are about choosing the right tone for the right situation. In IELTS, this is especially important because different tasks require different levels of formality. Learn the key differences, practise rewriting sentences in both styles, and pay close attention to tone in writing and speaking.

To continue building strong IELTS English, review Sentence Structure Basics, Modal Verbs, Passive Voice, Conjunctions and Linking Words, Collocations, Phrasal Verbs, Synonyms and Antonyms, and Word Families.