Formal and informal grammar choices

Formal and informal English are not separate sets of “correct” and “incorrect” grammar. They are choices we make for different situations. A message to a close friend and a letter to a university may communicate the same request, but the wording, contractions and sentence structure usually differ.

Informal: Hi Sam, can you send me the notes when you get a chance?
More formal: Dear Dr Patel, could you please send me the notes at your convenience?

Both are grammatical. The second suits a more formal relationship and gives the request extra distance.

What often changes with register?

Informal language commonly uses contractions (I’m, we’ve, can’t), everyday phrasal verbs (find out, put off) and shorter sentence patterns. Formal writing often prefers full forms (I am, we have, cannot), more explicit links and vocabulary such as discover or postpone. These are tendencies, not rules: phrasal verbs such as carry out are perfectly normal in formal contexts, and contractions appear in many modern professional messages.

Indirect questions can sound more polite or formal:

Direct: Where is the admissions office?
More indirect: Could you tell me where the admissions office is?

Notice the word order in the embedded question: where the office is, not where is the office.

Formal writing may use passive voice when the process or result matters more than the actor: The forms must be submitted by Friday. But active voice is often clearer: Please submit the forms by Friday. Do not use a passive just to make a sentence sound official.

Rewrite one request for three different readers

Suppose you need a course timetable.

The formal version is not more correct. It is designed for a reader who does not share much context with you. Naming the evening course prevents the office from having to guess which timetable you mean.

Politeness also depends on the size of the request. Could you send me the link? asks for a small action. Would it be possible to extend the deadline by a week? gives more space to a larger request. A longer expression is useful only when that extra distance serves a purpose.

Indirect questions keep statement order

Where does the course take place? becomes Could you tell me where the course takes place? Remove does inside the embedded clause and use takes with the course.

For a yes/no question, add if/whether: Is the course online? → Could you tell me whether the course is online? The sentence as a whole is still a question, so it ends with a question mark.

Compare I would like to know whether the course is online. This is a statement about what you want to know, so a full stop is appropriate.

Be consistent, not artificially formal

A message can become awkward if it combines a very formal opening with slang in the next sentence. Think about the reader, purpose and channel: a work email to a familiar colleague may be professional but warm; an application letter may need more distance; an academic paragraph usually avoids chat abbreviations.

Politeness does not mean adding long phrases everywhere. Could you send the file today? is clear and courteous. I would be most grateful if it might perhaps be possible for you to send... is unnecessarily indirect for many situations.

A direct form can also be polite when the relationship supports it: Please send the revised file by noon may be appropriate as a clear workplace instruction. Tone comes from wording, context and relationship together.

Common language differences to notice

Informal: The meeting was put off.
Neutral/formal: The meeting was postponed.

Informal: I can’t come, unfortunately.
More formal: Unfortunately, I cannot attend.

Conversational: The thing is, we don’t have enough time.
More formal: The main difficulty is that we have insufficient time.

Cambridge’s overview of formal and informal language and its page on contractions show how these choices work in different contexts.

Grammar choices that affect tone

Who I spoke to is natural in conversation and much professional writing. To whom I spoke is more formal. The first is not ungrammatical merely because the preposition comes at the end.

Similarly, The person I contacted omits an object relative pronoun. The person whom I contacted is more explicit and formal. But you cannot transfer that omission to a non-defining clause: Dr Chen, whom I contacted yesterday, ... still needs the relative word.

Do not automatically replace every everyday word with a longer one. Help is appropriate in formal writing; assist is an available alternative, not a requirement. A professional email can be warm and direct.

Revise for your reader

A weak formal draft might say It would be appreciated if consideration could be given to my request. The grammatical passives obscure who wants what. I would be grateful if you could consider my request is clearer and still formal.

For a friendly message, Can't make it tonight—sorry! Are you free tomorrow? may work because the shared context makes the missing I clear. In an application letter, use complete sentences: Unfortunately, I cannot attend the interview on Tuesday. Would another date be possible?

Before sending a message, check the relationship, purpose and information your reader needs. Consistent tone grows from those choices, rather than from using the longest grammatical construction available.

Sources and further reading

• Cambridge Dictionary: Formal and informal language
• Cambridge Dictionary: Contractions
• British Council LearnEnglish: An informal email to a friend