Must - a) it is necessary or important;
mustn’t - e) it is not okay/ it is prohibitedcan - b) it is okay/ permitted; can’t; e) it is not okay/ it is prohibitedhave to - a) it is necessary or important;
; don’t have to - d) it is not necessary; be allowed to - b) it is okay/ permitted; be not
allowed to; e) it is not okay/ it is prohibitedshould - c) it is a good idea (the correct thing to do); shouldn’t - f) it is not a good idea (not the correct thing); ought to - c) it is a good idea (the correct thing to do); need - c) it is a good idea (the correct thing to do); need not - d) it is not necessary