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