can certify
Verbo regolare: certify - certified- certified

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto 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	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	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I cannot certify
you cannot certify
he cannot certify
we cannot certify
you cannot certify
they cannot certify 	I cannot be certifying
you cannot be certifying
he cannot be certifying
we cannot be certifying
you cannot be certifying
they cannot be certifying	I cannot have certified
you cannot have certified
he cannot have certified
we cannot have certified
you cannot have certified
they cannot have certified	I cannot have been certifying
you cannot have been certifying
he cannot have been certifying
we cannot have been certifying
you cannot have been certifying
they cannot have been certifying	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto 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? 	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 semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
can I not certify?
can you not certify?
can he not certify?
can we not certify?
can you not certify?
can they not certify? 	can I not be certifying?
can you not be certifying?
can he not be certifying?
can we not be certifying?
can you not be certifying?
can they not be certifying? 	can I not have certified?
can you not have certified?
can he not have certified?
can we not have certified?
can you not have certified?
can they not have certified? 	can I not have been certifying?
can you not have been certifying?
can he not have been certifying?
can we not have been certifying?
can you not have been certifying?
can they not have been certifying?