I guarantee you vs I promise you

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

I guarantee you

Top 2,000 (common)

I promise you

Top 2,000 (common)
 I guarantee youI promise you
Pronunciation🇬🇧 //aɪ ˈɡærənˌti jʊ//🇺🇸 //aɪ ˈɡærənˌti jʊ//🇬🇧 //aɪ ˈprɒmɪs jʊ//🇺🇸 //aɪ ˈprɑːmɪs ju//
MeaningI promise you that something will happen.I will do what I say.
ExampleI guarantee you will love this new restaurant.I promise you, I will always be there for you.
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 2,000 (common)
Collocationsguarantee satisfaction, guarantee results, guarantee successI promise you everything, I promise you will win, I promise you my support, I promise you won't regret it
Common mistakesOmitting 'you' and saying 'I guarantee'., Using 'guarantee' with a noun directly instead of a personal pronoun., Confusing with 'ensure' which implies preventing something.Omitting 'you' makes it incomplete., Using 'promise' without 'I' sounds unnatural., Confusing with 'I promised you' for future assurances.
Usage notesUse in informal to neutral conversations to assure someone. Avoid in highly formal writing or speeches.Used in various contexts to assure someone. Generally neutral, but can become informal in casual conversations. Avoid in overly formal situations.

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I guarantee you
I promise you

Frequently asked questions: I guarantee you vs I promise you

What's the difference between I guarantee you and I promise you?

I guarantee you: I promise you that something will happen. I promise you: I will do what I say.

Can you show an example of each?

I guarantee you: I guarantee you will love this new restaurant. I promise you: I promise you, I will always be there for you.

Can I use I guarantee you and I promise you interchangeably?

Not always. I guarantee you and I promise you 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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