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 can't register you can't register he can't register we can't register you can't register they can't register
Forma com V-ing
I can't be registering you can't be registering he can't be registering we can't be registering you can't be registering they can't be registering
Perfeito
I can't have registered you can't have registered he can't have registered we can't have registered you can't have registered they can't have registered
Perfeito com V-ing
I can't have been registering you can't have been registering he can't have been registering we can't have been registering you can't have been registering they can't 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't I register? can't you register? can't he register? can't we register? can't you register? can't they register?
Forma com V-ing
can't I be registering? can't you be registering? can't he be registering? can't we be registering? can't you be registering? can't they be registering?
Perfeito
can't I have registered? can't you have registered? can't he have registered? can't we have registered? can't you have registered? can't they have registered?
Perfeito com V-ing
can't I have been registering? can't you have been registering? can't he have been registering? can't we have been registering? can't you have been registering? can't they have been registering?