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English · Rich vocabulary

Formal vs informal

Choose the right register.

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What is register?

Register means the level of formality in your writing or speech. Formal register uses proper grammar and sophisticated vocabulary. Informal register sounds relaxed and conversational, like chatting with friends. Choosing the right register depends on your audience and purpose.

Formal register

Formal writing appears in essays, letters to officials, reports and speeches. It avoids contractions like 'don't' and slang. Sentences are complete and precise. You might write 'I am writing to request' rather than 'I want to ask for'.

Informal register

Informal writing feels friendly and personal. It suits emails to friends, diary entries and creative dialogue. Contractions, everyday words and shorter sentences are fine. You might say 'Can't wait!' instead of 'I am eagerly anticipating'.

Matching register to purpose

Think about who will read your writing. A head teacher expects formal language in a complaint letter. Your best friend expects informal language in a text message. Mixing registers can confuse your reader or seem disrespectful.

Vocabulary choices

The same idea can be expressed formally or informally. 'Children' is neutral, 'kids' is informal, 'young people' is formal. 'Purchase' is formal, 'buy' is neutral, 'grab' is informal. Select words that match your register throughout.

Worked examples

  1. 1. Which sentence is formal: 'The concert was amazing!' or 'The performance was exceptional'?

    1. 'Amazing' is an everyday, enthusiastic word suitable for friends.
    2. 'Exceptional' is a more sophisticated, precise word.
    3. 'The performance was exceptional' uses formal vocabulary and avoids the exclamation mark.
    4. This sentence is formal.

  2. 2. Rewrite informally: 'I would be grateful if you could assist me with this matter.'

    1. Identify formal phrases: 'would be grateful', 'assist', 'this matter'.
    2. Replace with everyday words: 'grateful' becomes 'happy' or 'thanks', 'assist' becomes 'help', 'matter' becomes 'thing'.
    3. Use a contraction if natural: 'I would' becomes 'I'd'.
    4. Informal version: 'I'd really appreciate your help with this' or 'Could you help me with this?'

  3. 3. Choose the formal option: 'loads of people' or 'a large number of individuals'?

    1. 'Loads of' is casual, conversational language.
    2. 'A large number of' is precise and measured.
    3. 'Individuals' is more formal than 'people'.
    4. 'A large number of individuals' is formal.

Try it yourself

Which sentence suits a letter to the council: 'The park's a mess and needs sorting' or 'The park requires maintenance and improvement'?

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