I must mess you must mess she must mess we must mess you must mess they must mess
Forma con V-ing
I must be messing you must be messing she must be messing we must be messing you must be messing they must be messing
Perfecto
I must have messed you must have messed she must have messed we must have messed you must have messed they must have messed
Perfecto con V-ing
I must have been messing you must have been messing she must have been messing we must have been messing you must have been messing they must have been messing
Negación
Forma simple
I mustn't mess you mustn't mess she mustn't mess we mustn't mess you mustn't mess they mustn't mess
Forma con V-ing
I mustn't be messing you mustn't be messing she mustn't be messing we mustn't be messing you mustn't be messing they mustn't be messing
Perfecto
I mustn't have messed you mustn't have messed she mustn't have messed we mustn't have messed you mustn't have messed they mustn't have messed
Perfecto con V-ing
I mustn't have been messing you mustn't have been messing she mustn't have been messing we mustn't have been messing you mustn't have been messing they mustn't have been messing
Forma interrogativa
Forma simple
must I mess? must you mess? must she mess? must we mess? must you mess? must they mess?
Forma con V-ing
must I be messing? must you be messing? must she be messing? must we be messing? must you be messing? must they be messing?
Perfecto
must I have messed? must you have messed? must she have messed? must we have messed? must you have messed? must they have messed?
Perfecto con V-ing
must I have been messing? must you have been messing? must she have been messing? must we have been messing? must you have been messing? must they have been messing?
Forma interro-negativa
Forma simple
mustn't I mess? mustn't you mess? mustn't she mess? mustn't we mess? mustn't you mess? mustn't they mess?
Forma con V-ing
mustn't I be messing? mustn't you be messing? mustn't she be messing? mustn't we be messing? mustn't you be messing? mustn't they be messing?
Perfecto
mustn't I have messed? mustn't you have messed? mustn't she have messed? mustn't we have messed? mustn't you have messed? mustn't they have messed?
Perfecto con V-ing
mustn't I have been messing? mustn't you have been messing? mustn't she have been messing? mustn't we have been messing? mustn't you have been messing? mustn't they have been messing?