I can windsurf you can windsurf he can windsurf we can windsurf you can windsurf they can windsurf
Forma con V-ing
I can be windsurfing you can be windsurfing he can be windsurfing we can be windsurfing you can be windsurfing they can be windsurfing
Perfecto
I can have windsurfed you can have windsurfed he can have windsurfed we can have windsurfed you can have windsurfed they can have windsurfed
Perfecto con V-ing
I can have been windsurfing you can have been windsurfing he can have been windsurfing we can have been windsurfing you can have been windsurfing they can have been windsurfing
Negación
Forma simple
I cannot windsurf you cannot windsurf he cannot windsurf we cannot windsurf you cannot windsurf they cannot windsurf
Forma con V-ing
I cannot be windsurfing you cannot be windsurfing he cannot be windsurfing we cannot be windsurfing you cannot be windsurfing they cannot be windsurfing
Perfecto
I cannot have windsurfed you cannot have windsurfed he cannot have windsurfed we cannot have windsurfed you cannot have windsurfed they cannot have windsurfed
Perfecto con V-ing
I cannot have been windsurfing you cannot have been windsurfing he cannot have been windsurfing we cannot have been windsurfing you cannot have been windsurfing they cannot have been windsurfing
Forma interrogativa
Forma simple
can I windsurf? can you windsurf? can he windsurf? can we windsurf? can you windsurf? can they windsurf?
Forma con V-ing
can I be windsurfing? can you be windsurfing? can he be windsurfing? can we be windsurfing? can you be windsurfing? can they be windsurfing?
Perfecto
can I have windsurfed? can you have windsurfed? can he have windsurfed? can we have windsurfed? can you have windsurfed? can they have windsurfed?
Perfecto con V-ing
can I have been windsurfing? can you have been windsurfing? can he have been windsurfing? can we have been windsurfing? can you have been windsurfing? can they have been windsurfing?
Forma interro-negativa
Forma simple
can I not windsurf? can you not windsurf? can he not windsurf? can we not windsurf? can you not windsurf? can they not windsurf?
Forma con V-ing
can I not be windsurfing? can you not be windsurfing? can he not be windsurfing? can we not be windsurfing? can you not be windsurfing? can they not be windsurfing?
Perfecto
can I not have windsurfed? can you not have windsurfed? can he not have windsurfed? can we not have windsurfed? can you not have windsurfed? can they not have windsurfed?
Perfecto con V-ing
can I not have been windsurfing? can you not have been windsurfing? can he not have been windsurfing? can we not have been windsurfing? can you not have been windsurfing? can they not have been windsurfing?