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