I can register you can register he can register we can register you can register they can register
Forma com V-ing
I can be registering you can be registering he can be registering we can be registering you can be registering they can be registering
Perfeito
I can have registered you can have registered he can have registered we can have registered you can have registered they can have registered
Perfeito com V-ing
I can have been registering you can have been registering he can have been registering we can have been registering you can have been registering they can have been registering
Negação
Forma simple
I cannot register you cannot register he cannot register we cannot register you cannot register they cannot register
Forma com V-ing
I cannot be registering you cannot be registering he cannot be registering we cannot be registering you cannot be registering they cannot be registering
Perfeito
I cannot have registered you cannot have registered he cannot have registered we cannot have registered you cannot have registered they cannot have registered
Perfeito com V-ing
I cannot have been registering you cannot have been registering he 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 he register? can we register? can you register? can they register?
Forma com V-ing
can I be registering? can you be registering? can he be registering? can we be registering? can you be registering? can they be registering?
Perfeito
can I have registered? can you have registered? can he have registered? can we have registered? can you have registered? can they have registered?
Perfeito com V-ing
can I have been registering? can you have been registering? can he have been registering? can we have been registering? can you have been registering? can they have been registering?
Forma interro-Negação
Forma simple
can I not register? can you not register? can he not register? can we not register? can you not register? can they not register?
Forma com V-ing
can I not be registering? can you not be registering? can he not be registering? can we not be registering? can you not be registering? can they not be registering?
Perfeito
can I not have registered? can you not have registered? can he not have registered? can we not have registered? can you not have registered? can they not have registered?
Perfeito com V-ing
can I not have been registering? can you not have been registering? can he not have been registering? can we not have been registering? can you not have been registering? can they not have been registering?