I can itch you can itch he can itch we can itch you can itch they can itch
Forma con V-ing
I can be itching you can be itching he can be itching we can be itching you can be itching they can be itching
Perfecto
I can have itched you can have itched he can have itched we can have itched you can have itched they can have itched
Perfecto con V-ing
I can have been itching you can have been itching he can have been itching we can have been itching you can have been itching they can have been itching
Negación
Forma simple
I can't itch you can't itch he can't itch we can't itch you can't itch they can't itch
Forma con V-ing
I can't be itching you can't be itching he can't be itching we can't be itching you can't be itching they can't be itching
Perfecto
I can't have itched you can't have itched he can't have itched we can't have itched you can't have itched they can't have itched
Perfecto con V-ing
I can't have been itching you can't have been itching he can't have been itching we can't have been itching you can't have been itching they can't have been itching
Forma interrogativa
Forma simple
can I itch? can you itch? can he itch? can we itch? can you itch? can they itch?
Forma con V-ing
can I be itching? can you be itching? can he be itching? can we be itching? can you be itching? can they be itching?
Perfecto
can I have itched? can you have itched? can he have itched? can we have itched? can you have itched? can they have itched?
Perfecto con V-ing
can I have been itching? can you have been itching? can he have been itching? can we have been itching? can you have been itching? can they have been itching?
Forma interro-negativa
Forma simple
can't I itch? can't you itch? can't he itch? can't we itch? can't you itch? can't they itch?
Forma con V-ing
can't I be itching? can't you be itching? can't he be itching? can't we be itching? can't you be itching? can't they be itching?
Perfecto
can't I have itched? can't you have itched? can't he have itched? can't we have itched? can't you have itched? can't they have itched?
Perfecto con V-ing
can't I have been itching? can't you have been itching? can't he have been itching? can't we have been itching? can't you have been itching? can't they have been itching?