Formal vs informal vocabulary for CELPIP writing

Register is not about vocabulary range — it is about appropriateness

Many candidates study vocabulary lists to improve their Vocabulary Range score. That is useful, but it misses a more fundamental issue: using the right register for the right context.

You can have excellent vocabulary and still lose points because you used a casual phrase in a formal email, or a stiff formal construction in an email to a close friend. Examiners notice both.

The three registers in CELPIP writing

Informal register

Used when writing to close friends, family members, or people you know well in a casual context.

Characteristics:

• Contractions are natural (I'm, you're, can't, won't)
• Casual connectors (also, and, so, but)
• Conversational openers ("Hey!", "Hope you're doing well!")
• Short sentences and a relaxed tone

Common informal words:

• get → receive (upgrade for formal; use "get" freely in informal)
• want → would like (upgrade for formal)
• pretty good → quite good / excellent
• a lot → considerably / a great deal

Semi-formal register

Used when writing to acquaintances, neighbours, local community contacts, or people you know professionally but not closely.

Characteristics:

• Minimal contractions (avoid isn't, won't — prefer "is not," "will not")
• Polite but not stiff ("I wanted to reach out about…")
• Professional but approachable tone

Formal register

Used when writing to employers, managers, landlords, government contacts, or anyone in a position of authority you do not know personally.

Characteristics:

• No contractions whatsoever
• Formal openers: "I am writing to…", "I wish to bring to your attention…"
• Formal closings: "Sincerely,", "Yours faithfully," (for unknown recipients), "Regards,"
• Elevated vocabulary — but only where it sounds natural

Common formal upgrades:

The three most common register errors

1. Formal words in informal contexts

Writing "I sincerely apologise for any inconvenience this may have caused" to a close friend sounds robotic. A real friend would write "I'm really sorry about that — I should have let you know sooner."

Using overly formal language in an informal prompt signals that you are not reading the social context correctly. This is a Task Achievement failure, not just a vocabulary issue.

2. Contractions in formal emails

"I can't attend the meeting" in a formal email to a manager is the most common register slip. Always expand contractions in formal contexts: "I am unable to attend the meeting."

3. Casual connectors in formal writing

"So, the problem is that…" is too casual for a formal complaint email. Use "As a result, the situation has become…" or "Consequently, I am writing to request…"

A quick register check before you submit

After drafting your email, ask:

1. Greeting: Does it match the relationship? (Hi / Dear / Dear Sir or Madam)
2. Contractions: Are there any? (Remove all in formal, acceptable in informal)
3. Connectors: Are they register-appropriate? (Also/and for informal; Furthermore/In addition for formal)
4. Closing: Does it match your opening register? (Talk soon vs. Sincerely)

A response where the register is consistent from line one to the sign-off always outscores one that drifts.

Practice this

Submit a writing response and get specific feedback on whether your vocabulary register matches the prompt's required relationship.