I can scratch you can scratch he can scratch we can scratch you can scratch they can scratch
Forma con V-ing
I can be scratching you can be scratching he can be scratching we can be scratching you can be scratching they can be scratching
Perfecto
I can have scratched you can have scratched he can have scratched we can have scratched you can have scratched they can have scratched
Perfecto con V-ing
I can have been scratching you can have been scratching he can have been scratching we can have been scratching you can have been scratching they can have been scratching
Negación
Forma simple
I can't scratch you can't scratch he can't scratch we can't scratch you can't scratch they can't scratch
Forma con V-ing
I can't be scratching you can't be scratching he can't be scratching we can't be scratching you can't be scratching they can't be scratching
Perfecto
I can't have scratched you can't have scratched he can't have scratched we can't have scratched you can't have scratched they can't have scratched
Perfecto con V-ing
I can't have been scratching you can't have been scratching he can't have been scratching we can't have been scratching you can't have been scratching they can't have been scratching
Forma interrogativa
Forma simple
can I scratch? can you scratch? can he scratch? can we scratch? can you scratch? can they scratch?
Forma con V-ing
can I be scratching? can you be scratching? can he be scratching? can we be scratching? can you be scratching? can they be scratching?
Perfecto
can I have scratched? can you have scratched? can he have scratched? can we have scratched? can you have scratched? can they have scratched?
Perfecto con V-ing
can I have been scratching? can you have been scratching? can he have been scratching? can we have been scratching? can you have been scratching? can they have been scratching?
Forma interro-negativa
Forma simple
can't I scratch? can't you scratch? can't he scratch? can't we scratch? can't you scratch? can't they scratch?
Forma con V-ing
can't I be scratching? can't you be scratching? can't he be scratching? can't we be scratching? can't you be scratching? can't they be scratching?
Perfecto
can't I have scratched? can't you have scratched? can't he have scratched? can't we have scratched? can't you have scratched? can't they have scratched?
Perfecto con V-ing
can't I have been scratching? can't you have been scratching? can't he have been scratching? can't we have been scratching? can't you have been scratching? can't they have been scratching?