Conjugación del verbo inglés
CAN FAIL

Verbo regular: fail - failed - failed

Afirmación

Forma simple	Forma con V-ing
I can fail you can fail she can fail we can fail you can fail they can fail	I can be failing you can be failing she can be failing we can be failing you can be failing they can be failing
Perfecto	Perfecto con V-ing
I can have failed you can have failed she can have failed we can have failed you can have failed they can have failed	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

Negación

Forma simple	Forma con V-ing
I can't fail you can't fail she can't fail we can't fail you can't fail they can't fail	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
Perfecto	Perfecto con V-ing
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	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	Forma con V-ing
can I fail? can you fail? can she fail? can we fail? can you fail? can they fail?	can I be failing? can you be failing? can she be failing? can we be failing? can you be failing? can they be failing?
Perfecto	Perfecto con V-ing
can I have failed? can you have failed? can she have failed? can we have failed? can you have failed? can they have failed?	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-negativa

Forma simple	Forma con V-ing
can't I fail? can't you fail? can't she fail? can't we fail? can't you fail? can't they fail?	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?
Perfecto	Perfecto con V-ing
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?	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?