I guarantee you that

Meanings

1. 1phrasefixed phraseinformal

   Used to promise strongly that something is true or will happen.

   Grammar: Followed by a clause: I guarantee you that it will work.

   Patterns

   • I guarantee you that + clause

   I guarantee you that the tickets will sell out by Friday.

   I guarantee you that she will call you back today.

   I guarantee you that this is the best pizza in town.

2. 2phrasefixed phraseinformal

   Used to tell someone confidently what you believe will happen.

   Grammar: Often at the start of a sentence, before the main statement.

   Patterns

   • I guarantee you that + clause

   I guarantee you that he will forget his keys again.

   I guarantee you that the meeting will run late.

Common combinations

I guarantee you that it will work

Try this method; I guarantee you that it will work.

I guarantee you that you will love it

Watch the first episode; I guarantee you that you will love it.

I guarantee you that nothing will go wrong

Relax; I guarantee you that nothing will go wrong.

Synonyms and how they differ

I assure you that

More formal and often used to calm someone's worries.

I promise you that

Focuses on your personal commitment, not just on the prediction.

Word family

guarantee verb

To promise that something will be done or will happen.

guarantee noun

A promise, often in writing, that something will be repaired or replaced.

Commonly confused: I guarantee you that or I guarantee that?

Practice

Make it your own

Write a sentence using “I guarantee you that”, then check it and compare it with the examples above.

Explore more words