I mustna think of staying this winter, I'm sure, Christie.
Mrs Nesbitt is very kind; but you mustna say anything to her about this matter--or to any one.
And, dear, you mustna think of dreary things when you look out upon the snow, for it will be a long time before we see the green grass and the bonnie flowers again," and Graeme sighed.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "mustna" in a variety of sentences. We hope that you will now be able to make sentences using this word.