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