That must be the new one that Mardonale stole from Kondal.
That must be our first consideration, so that you, our guests, will have a protection in any emergency.
That must be an interesting metal," remarked Crane.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "that must" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.