I can guard you can guard he can guard we can guard you can guard they can guard
Forma con V-ing
I can be guarding you can be guarding he can be guarding we can be guarding you can be guarding they can be guarding
Perfecto
I can have guarded you can have guarded he can have guarded we can have guarded you can have guarded they can have guarded
Perfecto con V-ing
I can have been guarding you can have been guarding he can have been guarding we can have been guarding you can have been guarding they can have been guarding
Negación
Forma simple
I can't guard you can't guard he can't guard we can't guard you can't guard they can't guard
Forma con V-ing
I can't be guarding you can't be guarding he can't be guarding we can't be guarding you can't be guarding they can't be guarding
Perfecto
I can't have guarded you can't have guarded he can't have guarded we can't have guarded you can't have guarded they can't have guarded
Perfecto con V-ing
I can't have been guarding you can't have been guarding he can't have been guarding we can't have been guarding you can't have been guarding they can't have been guarding
Forma interrogativa
Forma simple
can I guard? can you guard? can he guard? can we guard? can you guard? can they guard?
Forma con V-ing
can I be guarding? can you be guarding? can he be guarding? can we be guarding? can you be guarding? can they be guarding?
Perfecto
can I have guarded? can you have guarded? can he have guarded? can we have guarded? can you have guarded? can they have guarded?
Perfecto con V-ing
can I have been guarding? can you have been guarding? can he have been guarding? can we have been guarding? can you have been guarding? can they have been guarding?
Forma interro-negativa
Forma simple
can't I guard? can't you guard? can't he guard? can't we guard? can't you guard? can't they guard?
Forma con V-ing
can't I be guarding? can't you be guarding? can't he be guarding? can't we be guarding? can't you be guarding? can't they be guarding?
Perfecto
can't I have guarded? can't you have guarded? can't he have guarded? can't we have guarded? can't you have guarded? can't they have guarded?
Perfecto con V-ing
can't I have been guarding? can't you have been guarding? can't he have been guarding? can't we have been guarding? can't you have been guarding? can't they have been guarding?