I can fail you can fail he can fail we can fail you can fail they can fail
Forma con V-ing
I can be failing you can be failing he can be failing we can be failing you can be failing they can be failing
Perfecto
I can have failed you can have failed he can have failed we can have failed you can have failed they can have failed
Perfecto con V-ing
I can have been failing you can have been failing he can have been failing we can have been failing you can have been failing they can have been failing
Negación
Forma simple
I can't fail you can't fail he can't fail we can't fail you can't fail they can't fail
Forma con V-ing
I can't be failing you can't be failing he can't be failing we can't be failing you can't be failing they can't be failing
Perfecto
I can't have failed you can't have failed he can't have failed we can't have failed you can't have failed they can't have failed
Perfecto con V-ing
I can't have been failing you can't have been failing he can't have been failing we can't have been failing you can't have been failing they can't have been failing
Forma interrogativa
Forma simple
can I fail? can you fail? can he fail? can we fail? can you fail? can they fail?
Forma con V-ing
can I be failing? can you be failing? can he be failing? can we be failing? can you be failing? can they be failing?
Perfecto
can I have failed? can you have failed? can he have failed? can we have failed? can you have failed? can they have failed?
Perfecto con V-ing
can I have been failing? can you have been failing? can he have been failing? can we have been failing? can you have been failing? can they have been failing?
Forma interro-negativa
Forma simple
can't I fail? can't you fail? can't he fail? can't we fail? can't you fail? can't they fail?
Forma con V-ing
can't I be failing? can't you be failing? can't he be failing? can't we be failing? can't you be failing? can't they be failing?
Perfecto
can't I have failed? can't you have failed? can't he have failed? can't we have failed? can't you have failed? can't they have failed?
Perfecto con V-ing
can't I have been failing? can't you have been failing? can't he have been failing? can't we have been failing? can't you have been failing? can't they have been failing?