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