I can sell you can sell he can sell we can sell you can sell they can sell
Forma con V-ing
I can be selling you can be selling he can be selling we can be selling you can be selling they can be selling
Perfecto
I can have sold you can have sold he can have sold we can have sold you can have sold they can have sold
Perfecto con V-ing
I can have been selling you can have been selling he can have been selling we can have been selling you can have been selling they can have been selling
Negación
Forma simple
I cannot sell you cannot sell he cannot sell we cannot sell you cannot sell they cannot sell
Forma con V-ing
I cannot be selling you cannot be selling he cannot be selling we cannot be selling you cannot be selling they cannot be selling
Perfecto
I cannot have sold you cannot have sold he cannot have sold we cannot have sold you cannot have sold they cannot have sold
Perfecto con V-ing
I cannot have been selling you cannot have been selling he cannot have been selling we cannot have been selling you cannot have been selling they cannot have been selling
Forma interrogativa
Forma simple
can I sell? can you sell? can he sell? can we sell? can you sell? can they sell?
Forma con V-ing
can I be selling? can you be selling? can he be selling? can we be selling? can you be selling? can they be selling?
Perfecto
can I have sold? can you have sold? can he have sold? can we have sold? can you have sold? can they have sold?
Perfecto con V-ing
can I have been selling? can you have been selling? can he have been selling? can we have been selling? can you have been selling? can they have been selling?
Forma interro-negativa
Forma simple
can I not sell? can you not sell? can he not sell? can we not sell? can you not sell? can they not sell?
Forma con V-ing
can I not be selling? can you not be selling? can he not be selling? can we not be selling? can you not be selling? can they not be selling?
Perfecto
can I not have sold? can you not have sold? can he not have sold? can we not have sold? can you not have sold? can they not have sold?
Perfecto con V-ing
can I not have been selling? can you not have been selling? can he not have been selling? can we not have been selling? can you not have been selling? can they not have been selling?