may certify
Regular verb: certify - certified- certified

Affirmation 	
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I may certify
you may certify
she may certify
we may certify
you may certify
they may certify 	I may be certifying
you may be certifying
she may be certifying
we may be certifying
you may be certifying
they may be certifying	I may have certified
you may have certified
she 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
she may have been certifying
we may have been certifying
you may have been certifying
they may have been certifying	

Negation 	
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I mayn't certify
you mayn't certify
she 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
she 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
she 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
she mayn't have been certifying
we mayn't have been certifying
you mayn't have been certifying
they mayn't have been certifying	

Interrogative form 	
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may I certify?
may you certify?
may she certify?
may we certify?
may you certify?
may they certify? 	may I be certifying?
may you be certifying?
may she be certifying?
may we be certifying?
may you be certifying?
may they be certifying? 	may I have certified?
may you have certified?
may she 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 she have been certifying?
may we have been certifying?
may you have been certifying?
may they have been certifying? 	

Interro-negative form 	
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mayn't I certify?
mayn't you certify?
mayn't she 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 she 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 she 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 she have been certifying?
mayn't we have been certifying?
mayn't you have been certifying?
mayn't they have been certifying?