I can walk you can walk he can walk we can walk you can walk they can walk
Forma con V-ing
I can be walking you can be walking he can be walking we can be walking you can be walking they can be walking
Perfecto
I can have walked you can have walked he can have walked we can have walked you can have walked they can have walked
Perfecto con V-ing
I can have been walking you can have been walking he can have been walking we can have been walking you can have been walking they can have been walking
Negación
Forma simple
I cannot walk you cannot walk he cannot walk we cannot walk you cannot walk they cannot walk
Forma con V-ing
I cannot be walking you cannot be walking he cannot be walking we cannot be walking you cannot be walking they cannot be walking
Perfecto
I cannot have walked you cannot have walked he cannot have walked we cannot have walked you cannot have walked they cannot have walked
Perfecto con V-ing
I cannot have been walking you cannot have been walking he cannot have been walking we cannot have been walking you cannot have been walking they cannot have been walking
Forma interrogativa
Forma simple
can I walk? can you walk? can he walk? can we walk? can you walk? can they walk?
Forma con V-ing
can I be walking? can you be walking? can he be walking? can we be walking? can you be walking? can they be walking?
Perfecto
can I have walked? can you have walked? can he have walked? can we have walked? can you have walked? can they have walked?
Perfecto con V-ing
can I have been walking? can you have been walking? can he have been walking? can we have been walking? can you have been walking? can they have been walking?
Forma interro-negativa
Forma simple
can I not walk? can you not walk? can he not walk? can we not walk? can you not walk? can they not walk?
Forma con V-ing
can I not be walking? can you not be walking? can he not be walking? can we not be walking? can you not be walking? can they not be walking?
Perfecto
can I not have walked? can you not have walked? can he not have walked? can we not have walked? can you not have walked? can they not have walked?
Perfecto con V-ing
can I not have been walking? can you not have been walking? can he not have been walking? can we not have been walking? can you not have been walking? can they not have been walking?