I can register you can register she can register we can register you can register they can register
Forma con V-ing
I can be registering you can be registering she can be registering we can be registering you can be registering they can be registering
Perfecto
I can have registered you can have registered she can have registered we can have registered you can have registered they can have registered
Perfecto con V-ing
I can have been registering you can have been registering she can have been registering we can have been registering you can have been registering they can have been registering
Negación
Forma simple
I cannot register you cannot register she cannot register we cannot register you cannot register they cannot register
Forma con V-ing
I cannot be registering you cannot be registering she cannot be registering we cannot be registering you cannot be registering they cannot be registering
Perfecto
I cannot have registered you cannot have registered she cannot have registered we cannot have registered you cannot have registered they cannot have registered
Perfecto con V-ing
I cannot have been registering you cannot have been registering she cannot have been registering we cannot have been registering you cannot have been registering they cannot have been registering
Forma interrogativa
Forma simple
can I register? can you register? can she register? can we register? can you register? can they register?
Forma con V-ing
can I be registering? can you be registering? can she be registering? can we be registering? can you be registering? can they be registering?
Perfecto
can I have registered? can you have registered? can she have registered? can we have registered? can you have registered? can they have registered?
Perfecto con V-ing
can I have been registering? can you have been registering? can she have been registering? can we have been registering? can you have been registering? can they have been registering?
Forma interro-negativa
Forma simple
can I not register? can you not register? can she not register? can we not register? can you not register? can they not register?
Forma con V-ing
can I not be registering? can you not be registering? can she not be registering? can we not be registering? can you not be registering? can they not be registering?
Perfecto
can I not have registered? can you not have registered? can she not have registered? can we not have registered? can you not have registered? can they not have registered?
Perfecto con V-ing
can I not have been registering? can you not have been registering? can she not have been registering? can we not have been registering? can you not have been registering? can they not have been registering?