English often has two words for the same thing — one formal and one informal. 'Children' (neutral/formal) and 'kids' (casual). 'Purchase' (formal) and 'buy' (everyday). 'Request' (formal) and 'ask for' (everyday). 'Receive' (formal) and 'get' (everyday). 'Inform' (formal) and 'tell' (everyday). The choice depends on the context. Academic essays, business letters, and formal reports use the formal words. Everyday conversations and informal writing use the casual words. Students who use only one register sound wrong in the other context. Using formal words in casual chat sounds stiff. Using casual words in formal writing sounds unprofessional. Knowing both registers gives students the ability to match language to context. The lesson covers the most common formal/informal pairs at A2-B1 level.
Before you start — think honestly about your own teaching and experience.
Look at the examples. Answer each question before reading the explanation — this is how your students will learn too.
PEOPLE:
children (neutral/formal) / kids (casual)
adults (neutral/formal) / grown-ups (casual)
men and women (neutral) / guys (very casual American)
VERBS:
purchase (formal) / buy (everyday)
receive (formal) / get (everyday)
require (formal) / need (everyday)
request (formal) / ask for (everyday)
inform (formal) / tell (everyday)
attempt (formal) / try (everyday)
commence (formal) / start, begin (everyday)
terminate (formal) / end (everyday)
NOUNS:
residence (formal) / home, house (everyday)
vehicle (formal) / car (everyday)
beverage (formal) / drink (everyday)
assistance (formal) / help (everyday)
Why does English have these pairs?
English has many register pairs because the language has borrowed words from many sources over centuries. Formal words often come from Latin or French (purchase, receive, require, residence). Informal words often come from Old English or Germanic roots (buy, get, need, home). Both work for the same idea but signal different contexts. Formal words signal seriousness, professionalism, written contexts. Informal words signal casualness, everyday contexts, speech. Students who know both can match language to context. Students who only know one set are limited. The pairs are particularly important for academic writing — students must use the formal alternatives instead of the everyday casual words. They are also important for casual speech — using formal words in casual chat sounds stiff or pretentious.
A: A student writes an academic essay about education.
FORMAL: 'Children's education requires significant investment.'
INFORMAL (wrong for context): 'Kids' education needs lots of money.'
B: A friend tells another friend about shopping yesterday.
INFORMAL (right for context): 'I bought a new phone yesterday.'
FORMAL (wrong for context): 'I purchased a new phone yesterday.'
C: A formal business letter requesting information.
FORMAL: 'I would be grateful if you could provide further information.'
INFORMAL (wrong for context): 'Could you give me more info?'
D: A casual chat in the kitchen.
INFORMAL (right): 'Can I have a drink?'
FORMAL (wrong): 'May I obtain a beverage?'
Why does matching register matter?
Each context has a typical register. Academic essays use formal language — children, purchase, require, request. Casual conversations use informal — kids, buy, need, ask for. Mismatching the register sounds wrong. 'Kids' education' in an academic essay sounds too casual. 'May I obtain a beverage' in a casual chat sounds pretentious. Students must learn to read the context — what kind of writing or speech is this? Then choose the right register. The signals: formal context (essay, report, business letter) → use formal alternatives. Casual context (friends, family, informal chat) → use casual alternatives. Match register to context. The mismatch can mark a student as a beginner or as missing the social rules of language.
For people: children (neutral, can be formal or casual). Kids (casual). Youngsters (neutral, slightly old-fashioned).
For verbs: get (casual). Receive (formal). Obtain (very formal). All mean the same thing.
For verbs: ask for (casual). Request (formal). Petition (very formal — for legal contexts).
When do students use neutral words?
Some words are neutral — they work in both formal and casual contexts. 'Children' is neutral — works in academic writing and in casual chat. 'House' is neutral — works in both. 'Tell' is also neutral and works widely. These neutral words are safe choices when students are unsure about register. The casual alternatives (kids, home (sometimes), inform) are more limited — they fit casual contexts but not formal. The very formal alternatives (purchase, residence, request) are more limited — they fit formal contexts but sound stiff in casual ones. Students should know the pattern: very formal — formal/neutral — neutral — casual — very casual. Each level fits its contexts. When in doubt, neutral is safe. For academic writing, prefer formal/neutral. For casual chat, prefer casual/neutral.
| Meaning | Formal | Neutral | Casual |
|---|---|---|---|
| Young people | children | children | kids |
| To get money for | purchase | buy | buy / get |
| To get something | receive | receive / get | get |
| To need | require | need | need |
| To ask formally | request | ask | ask for |
| To tell information | inform | tell | tell |
| To try | attempt | try | try / give it a go |
| To start | commence | begin | start / kick off |
| To end | terminate | end | finish / wrap up |
| Where you live | residence | home | home / place |
| Help | assistance | help | a hand |
| Drink | beverage | drink | drink |
DISTINCTION 1 — Children vs kids: Children is neutral/formal — works in any context. Kids is casual — fits friends, family, casual writing. In academic writing, business letters, news — use children. In casual chat, informal blog posts — kids works.
DISTINCTION 2 — Purchase vs buy: Purchase is formal — for business contracts, formal documents, law. Buy is everyday — works in most contexts. 'I bought a phone' (everyday). 'The contract states the parties shall purchase the goods' (legal/formal). Most students should use buy in everyday writing.
DISTINCTION 3 — Request vs ask for: Request is formal — for letters, applications, formal speech. Ask for is everyday. 'I am writing to request your assistance' (formal letter). 'Can I ask for some help?' (casual). Match register to context.
DISTINCTION 4 — Receive vs get: Receive is formal — for letters, business writing. Get is everyday. 'I received your letter yesterday' (formal). 'I got your message' (casual). Both work but signal different contexts.
DISTINCTION 5 — Commence vs start: Commence is very formal — for ceremonies, official announcements (covered in lesson #90). Start is everyday. The wedding ceremony commences at noon (formal). The lesson starts at 9 (everyday).
DISTINCTION 6 — Terminate vs end: Terminate is very formal — for contracts, legal agreements. End is everyday. The contract terminates on Friday (legal/formal). The lesson ends at 4 (everyday).
Register awareness is essential for B1+ English. Students who write academic essays must use formal alternatives. Students who chat casually should use everyday words. The mismatch is a common error — using kids in academic writing or using purchase between friends sounds wrong. The lesson connects to many other register lessons — hedging (#25), discourse markers (#30), opinion expressions (#40), thanks (#88), apologies (#92), invitations (#103). Together they cover register awareness across many situations.
Drill register pairs through context exercises. Give a sentence in formal English; students rewrite in casual. Give casual; students rewrite in formal. The exercise drills register awareness. Use real examples — academic essay paragraphs, casual conversations. Match the right register to the right context.
Choose the right word for each context — formal or casual.
Each sentence has a register mismatch. Suggest a better version and explain.
Use this sequence directly in class — guided discovery, no textbook needed. Tap each step to mark it done.
STEP 1 — What is register? (4 min): Establish that English has different ways of saying the same thing depending on context. Formal contexts (essays, business letters) use formal words. Casual contexts (chat, friends) use casual words. Match the register to the context.
STEP 2 — People words (4 min): Drill the people pairs. Children/kids. Adults/grown-ups. Men and women/guys (very casual). Show context examples. Practise using each in formal and casual contexts.
STEP 3 — Verbs (8 min): Drill the verb pairs. Purchase/buy. Receive/get. Require/need. Request/ask for. Inform/tell. Attempt/try. Commence/start. Terminate/end. Match each pair to formal and casual contexts.
STEP 4 — Nouns (5 min): Drill the noun pairs. Residence/home. Vehicle/car. Beverage/drink. Assistance/help. Neutral words (home, drink) often work in both contexts.
STEP 5 — Match register to context (4 min): Quick drill. Show a context (academic essay, casual chat, business letter, dinner with friends). Students choose appropriate register words. Speed forces awareness.
Use directly in class — copy, adapt, or read aloud. No printing needed.
For each strategy, choose the option that best describes where you are now.
Your feedback helps other teachers and helps us improve TeachAnyClass.