I'll tell you what vs Listen up vs Mark my words

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

I'll tell you what

InformalTop 3,000 (common)

Listen up

InformalBeyond 10,000 (less common)

Mark my words

InformalBeyond 10,000 (less common)
Most common: I'll tell you what
 I'll tell you whatListen upMark my words
Pronunciation🇬🇧 //aɪl tɛl jʊ wɒt//🇺🇸 //aɪl tɛl ju wɑt//🇬🇧 //ˈlɪsən ʌp//🇺🇸 //ˈlɪsən ʌp//🇬🇧 //mɑːk maɪ wɜːdz//🇺🇸 //mɑrk maɪ wɜrdz//
MeaningLet me explain something to you.Pay attention.Remember what I say, it will be important.
ExampleI'll tell you what, this food is amazing!Listen up, everyone, I have an announcement to make.Mark my words, he will regret this decision.
RegisterInformalInformalInformal
How commonTop 3,000 (common)Beyond 10,000 (less common)Beyond 10,000 (less common)
CollocationsI'll tell you what happened, I'll tell you what it means, I'll tell you what to dolisten up closely, listen up carefully, listen up allmark my words, remember my words, mark these words, mark those words
AntonymsI won't tell you, I'll keep it a secret, I refuse to sayignore, tune out, disregard, neglect-
Common mistakesUsing it in very formal contexts., Confusing it with 'I'll tell you that'., Not recognizing it as a phrase to emphasize a point.Used in formal situations where it's inappropriate., Mispronounced as 'listen up' instead of 'listen up'., Confused with 'listen' meaning to hear.Misplaced as a formal statement., Using it without context or meaning., Not using it with a prediction or warning.
Usage notesUsed in conversations to emphasize a point or introduce a strong opinion, often in informal settings. Not suitable for formal discussions.Commonly used to get someone's attention before giving instructions. Best in casual settings; may not suit formal situations.Use when you want to emphasize the seriousness of what you are saying. It's used in spoken language, often with a predictive tone.

See it in real clips

I'll tell you what
Listen up
Mark my words

Frequently asked questions: I'll tell you what vs Listen up vs Mark my words

What's the difference between I'll tell you what, Listen up, and Mark my words?

I'll tell you what: Let me explain something to you. Listen up: Pay attention. Mark my words: Remember what I say, it will be important.

Which is more common: I'll tell you what, Listen up, and Mark my words?

I'll tell you what is the most common in everyday English.

Can you show an example of each?

I'll tell you what: I'll tell you what, this food is amazing! Listen up: Listen up, everyone, I have an announcement to make. Mark my words: Mark my words, he will regret this decision.

Can I use I'll tell you what, Listen up, and Mark my words interchangeably?

Not always. I'll tell you what, Listen up, and Mark my words 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.