English Idiomatic Expression: MUST HAVE

By Robby

If you are new here please read this first.

This time around we’re going to look at the following English idiomatic expression:


Well, to tell you the truth, it’s not really your typical idiomatic expression because it only consists of two words.

I’d be more precise if I told you that MUST HAVE forms idiomatic expressions in combination with other words, and here’s a few examples:

  • I’m not feeling very well, I MUST HAVE eaten something bad!
  • So, you’re back from your trip – what was it like? It MUST HAVE been some experience!
  • Was Julie off for a couple of days? She MUST HAVE been sick!

Now, I hope you’ve started getting the bigger picture in terms of how MUST HAVE can be used.

But you’re always welcome to watch the video above where I’m giving you extra info on how to use this expression in real life!


Robby 😉

English Idiomatic Expressions

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  • You’re welcome my friend! 😉

  • Jovanny Polezh

    ah, that’s what was wrong… I see now 🙂
    It’s of help!
    bless you, Robby)


  • Hi Jovanny,

    You’re dead right in saying that “must haven’t” isn’t the correct way of referring to the fact that the person in question most likely hasn’t done something, the right way of saying it is the following:

    “She MUSTN’T HAVE eaten for a good while!”

    If you Google it up, you’ll see hundreds of thousands of search results which is a hard proof that it’s the proper way of saying it.

    Hope it answers your question!


    Robby 😉

  • Jovanny Polezh

    hi there, Robbie!

    Thanks for another video! Another thank for another video)

    Please check out my example whether it’s possible to say using the negative form:

    “well… She’s so weak, she must haven’t eaten for a good while”

    I just don’t know…some doubts about “must haven’t”…
    I googled it up as you recommended in one of your articles… so the result was bad enough. The number decreased tremendously in comparison to “must have”.

    I hope you can shed some light on this subject in question.