0 used to show that it is necessary or very important that something happens in the present or future: --
I must say, you look absolutely great.
formal "Must I sign this?" "Yes, you must."
Luggage must not be left unattended (= it is against the rules).
I must get some sleep.
Meat must be cooked thoroughly.
1 used to show that something is very likely, probable, or certain to be true: --
2 something that is necessary: --
3 something that is so good, you must do it, have it, or see it: --
It's a moderately entertaining film but it's certainly not a must-see.
4 used to show that it is necessary or important that something happen in the present or future: --
5 used to show that something is likely, probable, or certain to be true: --
If they have not got any amusements up in their backwoods, we mustn't have none.
Many of our participants clearly felt that they ' mustn't complain ', which may be an adaptive psychological strategy for coping with the vicissitudes of advancing age.
There must be an increased availability and access to drug treatment that is sensitive to pregnant and post-partum women in an urban society.
The stretching of these variables is restricted, however, by the condition that both terms in the equation of continuitymust remain of the same order of magnitude.
One mustn't think it's a miracle.
You mustn't reinforce the role with 'gimmicks'.
What you mustn't do is waver, say in the same breath that he both can and can't, and then claim that this contradiction proves that time travel is impossible.
Just because there are dark fogs which our sun hasn't yet penetrated we mustn't let the sun lose its glare.