I can fail you can fail she can fail we can fail you can fail they can fail
Forma com V-ing
I can be failing you can be failing she can be failing we can be failing you can be failing they can be failing
Perfeito
I can have failed you can have failed she can have failed we can have failed you can have failed they can have failed
Perfeito com V-ing
I can have been failing you can have been failing she can have been failing we can have been failing you can have been failing they can have been failing
Negação
Forma simple
I can't fail you can't fail she can't fail we can't fail you can't fail they can't fail
Forma com V-ing
I can't be failing you can't be failing she can't be failing we can't be failing you can't be failing they can't be failing
Perfeito
I can't have failed you can't have failed she can't have failed we can't have failed you can't have failed they can't have failed
Perfeito com V-ing
I can't have been failing you can't have been failing she 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 she fail? can we fail? can you fail? can they fail?
Forma com V-ing
can I be failing? can you be failing? can she be failing? can we be failing? can you be failing? can they be failing?
Perfeito
can I have failed? can you have failed? can she have failed? can we have failed? can you have failed? can they have failed?
Perfeito com V-ing
can I have been failing? can you have been failing? can she have been failing? can we have been failing? can you have been failing? can they have been failing?
Forma interro-Negação
Forma simple
can't I fail? can't you fail? can't she fail? can't we fail? can't you fail? can't they fail?
Forma com V-ing
can't I be failing? can't you be failing? can't she be failing? can't we be failing? can't you be failing? can't they be failing?
Perfeito
can't I have failed? can't you have failed? can't she have failed? can't we have failed? can't you have failed? can't they have failed?
Perfeito com V-ing
can't I have been failing? can't you have been failing? can't she have been failing? can't we have been failing? can't you have been failing? can't they have been failing?