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Grammartier

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Interactive Grammar: Formal and Informal Register

Distinguish and switch between formal and informal register appropriately in different contexts.

Grammar Explanation · Authentic Examples · Practice Exercises

Lesson progressNot started
Duration
~36 min
Exercises
24
Level
Advanced

Overview

Distinguish and switch between formal and informal register appropriately in different contexts.

Formal Features

  • LexisFormal vocabulary: commence, terminate, endeavour, reside, utilise
  • SyntaxNominalisations, passive voice, complex sentences, embedded clauses
  • AvoidContractions, phrasal verbs, first person (academic), slang
  • ExampleIt is recommended that the proposal be reviewed (not 'You should check the proposal')

Informal Features

  • LexisInformal: get, start, end, live, use, ask, try
  • GrammarContractions (can't, I've), ellipsis, phrasal verbs, direct address
  • HedgingInformal hedges: kind of, sort of, I mean, you know
  • ExampleYou should probably check the proposal again

Context Determines Choice

  • Academic essay / legal document → formal throughout
  • Business email to colleague → semi-formal (professional but not stiff)
  • Social media / casual chat → informal
  • ❌ Register mixing: The company is gonna commence operations → inconsistent

When to use

Academic writing

It is widely acknowledged that further investigation is required.

Formal email

I am writing to enquire about the status of my application.

Casual speech

I was gonna ask about my application — any news?

Business report

The implementation of the revised strategy commenced in Q3.

Register: Formal or Informal?

Identify the register or select the correct equivalent

Multiple Choice10 questions
1Which is formal?
2Formal equivalent of 'find out':
3Formal equivalent of 'end':
4Informal equivalent of 'commence':
5Which is inappropriate in an academic essay?
6Which feature marks FORMAL register?
7Most formal opening for a business letter:
8Formal equivalent of 'look into':
9Which sentence uses mixed register (error)?
10Which feature marks INFORMAL register?

Formal-Informal Equivalents

Write the formal version of the underlined informal word/phrase

Fill in the Blanks8 questions
1We need to(look into → formal)the cause of the discrepancy.
2Please(get in touch → formal)our office at your earliest convenience.
3They decided to(put off → formal)the launch until further notice.
4We must(find out → formal)the full extent of the liability.
5The meeting will(start → formal)at 9:00 sharp.
6I am writing to(ask about → formal)the status of my application.
7The proposal was(turned down → formal)by the board.
8She was asked to(set up → formal)a new compliance framework.

Register Shift: Informal → Formal

Rewrite each informal sentence in a fully formal register

Transform6 questions

1We're gonna look into the problem and get back to you. → (full formal)

2They put off the meeting 'cos of the bad weather. → (full formal)

3Hi, I want to ask about my job application. → (formal email)

4The new rule kicked in last month and stuff changed. → (full formal)

5We kind of think the project might not work out. → (academic)

6Can you wrap up the report by end of play Friday? → (formal email)

Frequently Asked Questions

What does this lesson on sentence structure cover?

Distinguish and switch between formal and informal register appropriately in different contexts.

Which CEFR level is this lesson designed for?

This lesson is designed for Advanced (C1) learners and forms part of the Sentence Structure section on Grammartier.

What is the best approach for studying this grammar topic?

Start with the definition, then study the examples carefully to understand how the pattern works in context. Practise identifying the structure in authentic sentences before producing your own — this recognition-first approach builds a strong foundation for accurate, confident use.

Your Grammar Learning Path

Follow the CEFR progression for this topic cluster.

  1. C1
    Ellipsis and Substitution
  2. C1
    Emphasis Structures
  3. C1
    Formal and Informal RegisterYou are here
  4. C1
    Hedging Language
  5. C1
    Nominalisation
  6. C2
    Academic Hedging and Precision
  7. C2
    Advanced Concession and Contrast

Before You Start

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