Of course you will vs Surely

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

Of course you will

Top 2,000 (common)

Surely

Top 2,000 (common)B1adverb
 Of course you willSurely
Pronunciation🇬🇧 //əv kɔːs ju wɪl//🇺🇸 //əv kɔrs ju wɪl//🇬🇧 /["/ˈʃʊəli//ˈʃɔːli/"]/🇺🇸 /["/ˈʃʊrli/"]/
MeaningIt's certain that you will do it.certainly; without a doubt
ExampleWhen you asked if you would pass the test, I said, 'Of course you will!'Surely we should do something about it?
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 2,000 (common)
CEFR level-B1
Part of speechadverb
CollocationsOf course you can, Of course not, Of course we willsurely believe, surely know, surely must
Antonyms-doubtfully, unsure
Common mistakesUsing 'of course you will' in a sarcastic tone when it doesn't apply., Confusing with 'of course not', which expresses a negative sentiment., Relying on it in formal presentations.Confusing 'surely' with 'sure' — 'sure' can be an adjective., Using 'surely' as a response when a simple 'yes' would suffice., Omitting 'surely' in a sentence where it clarifies certainty.
Usage notesCommonly used in conversations to express certainty or assurance. Suitable in both spoken and written contexts. Avoid in overly formal writing.Use 'surely' to express certainty. It’s appropriate in both spoken and written contexts but is more common in formal discussions. Avoid using it in very casual conversations where simpler words like 'definitely' might fit better.

See it in real clips

Of course you will
Surely

Frequently asked questions: Of course you will vs Surely

What's the difference between Of course you will and Surely?

Of course you will: It's certain that you will do it. Surely: certainly; without a doubt

Can you show an example of each?

Of course you will: When you asked if you would pass the test, I said, 'Of course you will!' Surely: Surely we should do something about it?

Can I use Of course you will and Surely interchangeably?

Not always. Of course you will and Surely 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.

Related comparisons