may certify
Verbo regular: certify - certified- certified

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I may certify
you may certify
he may certify
we may certify
you may certify
they may certify 	I may be certifying
you may be certifying
he may be certifying
we may be certifying
you may be certifying
they may be certifying	I may have certified
you may have certified
he may have certified
we may have certified
you may have certified
they may have certified	I may have been certifying
you may have been certifying
he may have been certifying
we may have been certifying
you may have been certifying
they may have been certifying	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mayn't certify
you mayn't certify
he mayn't certify
we mayn't certify
you mayn't certify
they mayn't certify 	I mayn't be certifying
you mayn't be certifying
he mayn't be certifying
we mayn't be certifying
you mayn't be certifying
they mayn't be certifying	I mayn't have certified
you mayn't have certified
he mayn't have certified
we mayn't have certified
you mayn't have certified
they mayn't have certified	I mayn't have been certifying
you mayn't have been certifying
he mayn't have been certifying
we mayn't have been certifying
you mayn't have been certifying
they mayn't have been certifying	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
may I certify?
may you certify?
may he certify?
may we certify?
may you certify?
may they certify? 	may I be certifying?
may you be certifying?
may he be certifying?
may we be certifying?
may you be certifying?
may they be certifying? 	may I have certified?
may you have certified?
may he have certified?
may we have certified?
may you have certified?
may they have certified? 	may I have been certifying?
may you have been certifying?
may he have been certifying?
may we have been certifying?
may you have been certifying?
may they have been certifying? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mayn't I certify?
mayn't you certify?
mayn't he certify?
mayn't we certify?
mayn't you certify?
mayn't they certify? 	mayn't I be certifying?
mayn't you be certifying?
mayn't he be certifying?
mayn't we be certifying?
mayn't you be certifying?
mayn't they be certifying? 	mayn't I have certified?
mayn't you have certified?
mayn't he have certified?
mayn't we have certified?
mayn't you have certified?
mayn't they have certified? 	mayn't I have been certifying?
mayn't you have been certifying?
mayn't he have been certifying?
mayn't we have been certifying?
mayn't you have been certifying?
mayn't they have been certifying?