I can know you can know he can know we can know you can know they can know
Forma con V-ing
I can be knowing you can be knowing he can be knowing we can be knowing you can be knowing they can be knowing
Perfecto
I can have known you can have known he can have known we can have known you can have known they can have known
Perfecto con V-ing
I can have been knowing you can have been knowing he can have been knowing we can have been knowing you can have been knowing they can have been knowing
Negación
Forma simple
I can't know you can't know he can't know we can't know you can't know they can't know
Forma con V-ing
I can't be knowing you can't be knowing he can't be knowing we can't be knowing you can't be knowing they can't be knowing
Perfecto
I can't have known you can't have known he can't have known we can't have known you can't have known they can't have known
Perfecto con V-ing
I can't have been knowing you can't have been knowing he can't have been knowing we can't have been knowing you can't have been knowing they can't have been knowing
Forma interrogativa
Forma simple
can I know? can you know? can he know? can we know? can you know? can they know?
Forma con V-ing
can I be knowing? can you be knowing? can he be knowing? can we be knowing? can you be knowing? can they be knowing?
Perfecto
can I have known? can you have known? can he have known? can we have known? can you have known? can they have known?
Perfecto con V-ing
can I have been knowing? can you have been knowing? can he have been knowing? can we have been knowing? can you have been knowing? can they have been knowing?
Forma interro-negativa
Forma simple
can't I know? can't you know? can't he know? can't we know? can't you know? can't they know?
Forma con V-ing
can't I be knowing? can't you be knowing? can't he be knowing? can't we be knowing? can't you be knowing? can't they be knowing?
Perfecto
can't I have known? can't you have known? can't he have known? can't we have known? can't you have known? can't they have known?
Perfecto con V-ing
can't I have been knowing? can't you have been knowing? can't he have been knowing? can't we have been knowing? can't you have been knowing? can't they have been knowing?