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