I can swim you can swim he can swim we can swim you can swim they can swim
Forma con V-ing
I can be swimming you can be swimming he can be swimming we can be swimming you can be swimming they can be swimming
Perfecto
I can have swum you can have swum he can have swum we can have swum you can have swum they can have swum
Perfecto con V-ing
I can have been swimming you can have been swimming he can have been swimming we can have been swimming you can have been swimming they can have been swimming
Negación
Forma simple
I can't swim you can't swim he can't swim we can't swim you can't swim they can't swim
Forma con V-ing
I can't be swimming you can't be swimming he can't be swimming we can't be swimming you can't be swimming they can't be swimming
Perfecto
I can't have swum you can't have swum he can't have swum we can't have swum you can't have swum they can't have swum
Perfecto con V-ing
I can't have been swimming you can't have been swimming he can't have been swimming we can't have been swimming you can't have been swimming they can't have been swimming
Forma interrogativa
Forma simple
can I swim? can you swim? can he swim? can we swim? can you swim? can they swim?
Forma con V-ing
can I be swimming? can you be swimming? can he be swimming? can we be swimming? can you be swimming? can they be swimming?
Perfecto
can I have swum? can you have swum? can he have swum? can we have swum? can you have swum? can they have swum?
Perfecto con V-ing
can I have been swimming? can you have been swimming? can he have been swimming? can we have been swimming? can you have been swimming? can they have been swimming?
Forma interro-negativa
Forma simple
can't I swim? can't you swim? can't he swim? can't we swim? can't you swim? can't they swim?
Forma con V-ing
can't I be swimming? can't you be swimming? can't he be swimming? can't we be swimming? can't you be swimming? can't they be swimming?
Perfecto
can't I have swum? can't you have swum? can't he have swum? can't we have swum? can't you have swum? can't they have swum?
Perfecto con V-ing
can't I have been swimming? can't you have been swimming? can't he have been swimming? can't we have been swimming? can't you have been swimming? can't they have been swimming?