Conjugación del verbo inglés
CAN CERTIFY

Verbo regular: certify - certified - certified

Afirmación

Forma simple	Forma con V-ing
I can certify you can certify he can certify we can certify you can certify they can certify	I can be certifying you can be certifying he can be certifying we can be certifying you can be certifying they can be certifying
Perfecto	Perfecto con V-ing
I can have certified you can have certified he can have certified we can have certified you can have certified they can have certified	I can have been certifying you can have been certifying he can have been certifying we can have been certifying you can have been certifying they can have been certifying

Negación

Forma simple	Forma con V-ing
I can't certify you can't certify he can't certify we can't certify you can't certify they can't certify	I can't be certifying you can't be certifying he can't be certifying we can't be certifying you can't be certifying they can't be certifying
Perfecto	Perfecto con V-ing
I can't have certified you can't have certified he can't have certified we can't have certified you can't have certified they can't have certified	I can't have been certifying you can't have been certifying he can't have been certifying we can't have been certifying you can't have been certifying they can't have been certifying

Forma interrogativa

Forma simple	Forma con V-ing
can I certify? can you certify? can he certify? can we certify? can you certify? can they certify?	can I be certifying? can you be certifying? can he be certifying? can we be certifying? can you be certifying? can they be certifying?
Perfecto	Perfecto con V-ing
can I have certified? can you have certified? can he have certified? can we have certified? can you have certified? can they have certified?	can I have been certifying? can you have been certifying? can he have been certifying? can we have been certifying? can you have been certifying? can they have been certifying?

Forma interro-negativa

Forma simple	Forma con V-ing
can't I certify? can't you certify? can't he certify? can't we certify? can't you certify? can't they certify?	can't I be certifying? can't you be certifying? can't he be certifying? can't we be certifying? can't you be certifying? can't they be certifying?
Perfecto	Perfecto con V-ing
can't I have certified? can't you have certified? can't he have certified? can't we have certified? can't you have certified? can't they have certified?	can't I have been certifying? can't you have been certifying? can't he have been certifying? can't we have been certifying? can't you have been certifying? can't they have been certifying?