I can frog you can frog he can frog we can frog you can frog they can frog
Forma con V-ing
I can be froging you can be froging he can be froging we can be froging you can be froging they can be froging
Perfecto
I can have froged you can have froged he can have froged we can have froged you can have froged they can have froged
Perfecto con V-ing
I can have been froging you can have been froging he can have been froging we can have been froging you can have been froging they can have been froging
Negación
Forma simple
I can't frog you can't frog he can't frog we can't frog you can't frog they can't frog
Forma con V-ing
I can't be froging you can't be froging he can't be froging we can't be froging you can't be froging they can't be froging
Perfecto
I can't have froged you can't have froged he can't have froged we can't have froged you can't have froged they can't have froged
Perfecto con V-ing
I can't have been froging you can't have been froging he can't have been froging we can't have been froging you can't have been froging they can't have been froging
Forma interrogativa
Forma simple
can I frog? can you frog? can he frog? can we frog? can you frog? can they frog?
Forma con V-ing
can I be froging? can you be froging? can he be froging? can we be froging? can you be froging? can they be froging?
Perfecto
can I have froged? can you have froged? can he have froged? can we have froged? can you have froged? can they have froged?
Perfecto con V-ing
can I have been froging? can you have been froging? can he have been froging? can we have been froging? can you have been froging? can they have been froging?
Forma interro-negativa
Forma simple
can't I frog? can't you frog? can't he frog? can't we frog? can't you frog? can't they frog?
Forma con V-ing
can't I be froging? can't you be froging? can't he be froging? can't we be froging? can't you be froging? can't they be froging?
Perfecto
can't I have froged? can't you have froged? can't he have froged? can't we have froged? can't you have froged? can't they have froged?
Perfecto con V-ing
can't I have been froging? can't you have been froging? can't he have been froging? can't we have been froging? can't you have been froging? can't they have been froging?