can certify
Verbo regular: certify - certified- certified

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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	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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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	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 com V-ing 	Perfeito 	Perfeito com 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? 	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-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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? 	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?