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 can't sell you can't sell he can't sell we can't sell you can't sell they can't sell
Forma con V-ing
I can't be selling you can't be selling he can't be selling we can't be selling you can't be selling they can't be selling
Perfecto
I can't have sold you can't have sold he can't have sold we can't have sold you can't have sold they can't have sold
Perfecto con V-ing
I can't have been selling you can't have been selling he can't have been selling we can't have been selling you can't have been selling they can't 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't I sell? can't you sell? can't he sell? can't we sell? can't you sell? can't they sell?
Forma con V-ing
can't I be selling? can't you be selling? can't he be selling? can't we be selling? can't you be selling? can't they be selling?
Perfecto
can't I have sold? can't you have sold? can't he have sold? can't we have sold? can't you have sold? can't they have sold?
Perfecto con V-ing
can't I have been selling? can't you have been selling? can't he have been selling? can't we have been selling? can't you have been selling? can't they have been selling?