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