I can sharpen you can sharpen he can sharpen we can sharpen you can sharpen they can sharpen
Forma con V-ing
I can be sharpening you can be sharpening he can be sharpening we can be sharpening you can be sharpening they can be sharpening
Perfecto
I can have sharpened you can have sharpened he can have sharpened we can have sharpened you can have sharpened they can have sharpened
Perfecto con V-ing
I can have been sharpening you can have been sharpening he can have been sharpening we can have been sharpening you can have been sharpening they can have been sharpening
Negación
Forma simple
I can't sharpen you can't sharpen he can't sharpen we can't sharpen you can't sharpen they can't sharpen
Forma con V-ing
I can't be sharpening you can't be sharpening he can't be sharpening we can't be sharpening you can't be sharpening they can't be sharpening
Perfecto
I can't have sharpened you can't have sharpened he can't have sharpened we can't have sharpened you can't have sharpened they can't have sharpened
Perfecto con V-ing
I can't have been sharpening you can't have been sharpening he can't have been sharpening we can't have been sharpening you can't have been sharpening they can't have been sharpening
Forma interrogativa
Forma simple
can I sharpen? can you sharpen? can he sharpen? can we sharpen? can you sharpen? can they sharpen?
Forma con V-ing
can I be sharpening? can you be sharpening? can he be sharpening? can we be sharpening? can you be sharpening? can they be sharpening?
Perfecto
can I have sharpened? can you have sharpened? can he have sharpened? can we have sharpened? can you have sharpened? can they have sharpened?
Perfecto con V-ing
can I have been sharpening? can you have been sharpening? can he have been sharpening? can we have been sharpening? can you have been sharpening? can they have been sharpening?
Forma interro-negativa
Forma simple
can't I sharpen? can't you sharpen? can't he sharpen? can't we sharpen? can't you sharpen? can't they sharpen?
Forma con V-ing
can't I be sharpening? can't you be sharpening? can't he be sharpening? can't we be sharpening? can't you be sharpening? can't they be sharpening?
Perfecto
can't I have sharpened? can't you have sharpened? can't he have sharpened? can't we have sharpened? can't you have sharpened? can't they have sharpened?
Perfecto con V-ing
can't I have been sharpening? can't you have been sharpening? can't he have been sharpening? can't we have been sharpening? can't you have been sharpening? can't they have been sharpening?