Most phrasal verbs have a single-word synonym of Latin or French origin: put off / postpone, find out / discover, give up / abandon. The two versions usually mean the same thing, but they belong to different registers — one sounds conversational, the other sounds formal.
This is not a correctness question. She postponed the meeting and she put the meeting off are both correct English. The choice is about fit: which version matches the situation you're writing for.
The pairs
A compact map of the most common swaps.
| PHRASAL VERB | FORMAL ALTERNATIVE |
|---|---|
| give up | abandon, surrender, quit |
| put off | postpone, defer |
| find out | discover, ascertain |
| look into | investigate, examine |
| come across | encounter |
| go on | continue, proceed |
| put up with | tolerate, endure |
| carry out | execute, conduct, perform |
| bring about | cause, produce |
| turn down | reject, decline |
| go over | review, examine |
| cut down on | reduce, decrease |
The formal column is not a one-to-one replacement. Context decides which synonym fits — ascertain suits a legal context, discover suits almost any context, and find out suits a conversation.
Same verb in meaning, completely different feel.
When each register fits
Register is a match between the text and its situation. A few anchors.
Phrasal verbs are the default in conversation, text messages, personal emails, blog posts, marketing copy, fiction dialogue, and anything meant to sound human. In these contexts a Latinate verb can feel stiff or distant.
Formal alternatives fit academic essays, scientific papers, legal documents, policy texts, formal reports, and business writing at a senior level. Here, phrasal verbs can read as casual and imprecise.
The middle ground — business emails, journalism, white papers, textbooks — is exactly that: middle. A mix of both registers reads as natural. Writing that uses only Latinate verbs in this range starts to feel corporate and dry.
The distinction isn't absolute
Several phrasal verbs are perfectly at home in formal writing. They have no natural single-word replacement, or the replacement is worse.
- carry out an experiment, a review, an investigation
- point out a flaw, a discrepancy
- account for a result
- consist of three sections
- based on prior research
- focus on a narrow question
Academic writing is full of these. Replacing the study consists of four parts with the study comprises four parts is a choice of flavour, not a correction. Replacing carry out research with execute research sounds odd.
The real rule is narrower than "avoid phrasal verbs in formal writing". It is: avoid phrasal verbs that sound casual in a context that calls for precision. A phrasal verb with a neutral or technical feel stays.
When the formal version backfires
Over-swapping is a common B2 mistake. The writer learns the pairs, applies them everywhere, and the result sounds stilted rather than sophisticated.
This is technically formal but awkward for a routine business email. Found out or confirmed would read better.
A Latinate verb that is rarely used in speech (ascertain, endeavour, utilise, commence) often sounds pretentious outside very formal contexts. If you wouldn't say it out loud in a meeting, think twice before putting it in an email.
The other direction is the same mistake in reverse: using a very informal phrasal verb in a context that demands distance.
In a formal contract review, would not accept or would not tolerate reads cleaner.
Common mistakes
Over-formal swaps in everyday writing
Informal phrasal verbs in formal contexts
Replacing a phrasal verb that already fits
Wrong synonym for the context