Confirm vs Ensure

When to use each in English, with meaning, register, and examples.

Confirm

Top 2,000 (common)B1verb

Ensure

Top 2,000 (common)B2verb
 ConfirmEnsure
Pronunciation🇬🇧 //kənˈfɜːm//🇺🇸 //kənˈfɜrm//🇬🇧 /["/ɪnˈʃʊə(r)//ɪnˈʃɔː(r)/","/ɪnˈʃʊəz//ɪnˈʃɔːz/","/ɪnˈʃʊəd//ɪnˈʃɔːd/","/ɪnˈʃʊərɪŋ//ɪnˈʃɔːrɪŋ/"]/🇺🇸 /["/ɪnˈʃʊr/","/ɪnˈʃʊrz/","/ɪnˈʃʊrd/","/ɪnˈʃʊrɪŋ/"]/
MeaningTo say that something is true or to make sure of it.To make sure something happens or is true.
ExampleCan you confirm the time for the meeting tomorrow?Please ensure that all doors are locked before leaving the building.
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 2,000 (common)
CEFR levelB1B2
Part of speechverbverb
Collocationsconfirm a reservation, confirm an appointment, confirm information, confirm a hypothesis, confirm resultspractically, virtually, effectively, must, aim to, try to, an attempt to ensure something, efforts to ensure something, measures to ensure something
Antonymsdeny, disprove, rejectneglect, ignore
Common mistakesConfused with 'affirm' which is more formal., Using 'confirm' without an object in sentences., Incorrectly assuming 'confirmed' is always followed by a date.Confused with 'insure' which relates to insurance., Used incorrectly as a standalone verb without an object., Mispronounced as 'en-sure' instead of 'en-shur'.
Usage notesUse 'confirm' in both formal and informal contexts, such as meetings or casual conversations. It's appropriate when verifying information or giving approval.Use 'ensure' when you want to guarantee an outcome or confirm safety. It's appropriate in both spoken and written contexts, though more commonly in formal writing. Avoid using 'ensure' in casual conversations where simpler words like 'make sure' might be more fitting.

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Confirm

Frequently asked questions: Confirm vs Ensure

What's the difference between Confirm and Ensure?

Confirm: To say that something is true or to make sure of it. Ensure: To make sure something happens or is true.

Which is more advanced: Confirm and Ensure?

Ensure is the highest level, at B2, on the CEFR scale.

Are Confirm and Ensure the same CEFR level?

Confirm: B1, Ensure: B2 on the CEFR scale.

What part of speech are Confirm and Ensure?

Confirm: verb, Ensure: verb.

Can you show an example of each?

Confirm: Can you confirm the time for the meeting tomorrow? Ensure: Please ensure that all doors are locked before leaving the building.

Can I use Confirm and Ensure interchangeably?

Not always. Confirm and Ensure are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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