I can modify you can modify he can modify we can modify you can modify they can modify
Forma con V-ing
I can be modifying you can be modifying he can be modifying we can be modifying you can be modifying they can be modifying
Perfecto
I can have modified you can have modified he can have modified we can have modified you can have modified they can have modified
Perfecto con V-ing
I can have been modifying you can have been modifying he can have been modifying we can have been modifying you can have been modifying they can have been modifying
Negación
Forma simple
I can't modify you can't modify he can't modify we can't modify you can't modify they can't modify
Forma con V-ing
I can't be modifying you can't be modifying he can't be modifying we can't be modifying you can't be modifying they can't be modifying
Perfecto
I can't have modified you can't have modified he can't have modified we can't have modified you can't have modified they can't have modified
Perfecto con V-ing
I can't have been modifying you can't have been modifying he can't have been modifying we can't have been modifying you can't have been modifying they can't have been modifying
Forma interrogativa
Forma simple
can I modify? can you modify? can he modify? can we modify? can you modify? can they modify?
Forma con V-ing
can I be modifying? can you be modifying? can he be modifying? can we be modifying? can you be modifying? can they be modifying?
Perfecto
can I have modified? can you have modified? can he have modified? can we have modified? can you have modified? can they have modified?
Perfecto con V-ing
can I have been modifying? can you have been modifying? can he have been modifying? can we have been modifying? can you have been modifying? can they have been modifying?
Forma interro-negativa
Forma simple
can't I modify? can't you modify? can't he modify? can't we modify? can't you modify? can't they modify?
Forma con V-ing
can't I be modifying? can't you be modifying? can't he be modifying? can't we be modifying? can't you be modifying? can't they be modifying?
Perfecto
can't I have modified? can't you have modified? can't he have modified? can't we have modified? can't you have modified? can't they have modified?
Perfecto con V-ing
can't I have been modifying? can't you have been modifying? can't he have been modifying? can't we have been modifying? can't you have been modifying? can't they have been modifying?