I must better you must better he must better we must better you must better they must better
Forma con V-ing
I must be bettering you must be bettering he must be bettering we must be bettering you must be bettering they must be bettering
Perfecto
I must have bettered you must have bettered he must have bettered we must have bettered you must have bettered they must have bettered
Perfecto con V-ing
I must have been bettering you must have been bettering he must have been bettering we must have been bettering you must have been bettering they must have been bettering
Negación
Forma simple
I mustn't better you mustn't better he mustn't better we mustn't better you mustn't better they mustn't better
Forma con V-ing
I mustn't be bettering you mustn't be bettering he mustn't be bettering we mustn't be bettering you mustn't be bettering they mustn't be bettering
Perfecto
I mustn't have bettered you mustn't have bettered he mustn't have bettered we mustn't have bettered you mustn't have bettered they mustn't have bettered
Perfecto con V-ing
I mustn't have been bettering you mustn't have been bettering he mustn't have been bettering we mustn't have been bettering you mustn't have been bettering they mustn't have been bettering
Forma interrogativa
Forma simple
must I better? must you better? must he better? must we better? must you better? must they better?
Forma con V-ing
must I be bettering? must you be bettering? must he be bettering? must we be bettering? must you be bettering? must they be bettering?
Perfecto
must I have bettered? must you have bettered? must he have bettered? must we have bettered? must you have bettered? must they have bettered?
Perfecto con V-ing
must I have been bettering? must you have been bettering? must he have been bettering? must we have been bettering? must you have been bettering? must they have been bettering?
Forma interro-negativa
Forma simple
mustn't I better? mustn't you better? mustn't he better? mustn't we better? mustn't you better? mustn't they better?
Forma con V-ing
mustn't I be bettering? mustn't you be bettering? mustn't he be bettering? mustn't we be bettering? mustn't you be bettering? mustn't they be bettering?
Perfecto
mustn't I have bettered? mustn't you have bettered? mustn't he have bettered? mustn't we have bettered? mustn't you have bettered? mustn't they have bettered?
Perfecto con V-ing
mustn't I have been bettering? mustn't you have been bettering? mustn't he have been bettering? mustn't we have been bettering? mustn't you have been bettering? mustn't they have been bettering?