"We are not supposed to wait for her today."
Translation:Dnes na ni nemáme čekat.
Would you have an example of the other sentence? I have gone through several in the back but have not come across one that would look weird. So it is hard to tell. We might have it wrong somewhere or, and i cannot come up with en example now, it might totally be possible to use it in such a way. MÍT is a very widely used expression.