may certificate
Regular verb: certificate - certificated- certificated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may certificate
you may certificate
he may certificate
we may certificate
you may certificate
they may certificate 	I may be certificating
you may be certificating
he may be certificating
we may be certificating
you may be certificating
they may be certificating	I may have certificated
you may have certificated
he may have certificated
we may have certificated
you may have certificated
they may have certificated	I may have been certificating
you may have been certificating
he may have been certificating
we may have been certificating
you may have been certificating
they may have been certificating	

Negation 	
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I mayn't certificate
you mayn't certificate
he mayn't certificate
we mayn't certificate
you mayn't certificate
they mayn't certificate 	I mayn't be certificating
you mayn't be certificating
he mayn't be certificating
we mayn't be certificating
you mayn't be certificating
they mayn't be certificating	I mayn't have certificated
you mayn't have certificated
he mayn't have certificated
we mayn't have certificated
you mayn't have certificated
they mayn't have certificated	I mayn't have been certificating
you mayn't have been certificating
he mayn't have been certificating
we mayn't have been certificating
you mayn't have been certificating
they mayn't have been certificating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I certificate?
may you certificate?
may he certificate?
may we certificate?
may you certificate?
may they certificate? 	may I be certificating?
may you be certificating?
may he be certificating?
may we be certificating?
may you be certificating?
may they be certificating? 	may I have certificated?
may you have certificated?
may he have certificated?
may we have certificated?
may you have certificated?
may they have certificated? 	may I have been certificating?
may you have been certificating?
may he have been certificating?
may we have been certificating?
may you have been certificating?
may they have been certificating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I certificate?
mayn't you certificate?
mayn't he certificate?
mayn't we certificate?
mayn't you certificate?
mayn't they certificate? 	mayn't I be certificating?
mayn't you be certificating?
mayn't he be certificating?
mayn't we be certificating?
mayn't you be certificating?
mayn't they be certificating? 	mayn't I have certificated?
mayn't you have certificated?
mayn't he have certificated?
mayn't we have certificated?
mayn't you have certificated?
mayn't they have certificated? 	mayn't I have been certificating?
mayn't you have been certificating?
mayn't he have been certificating?
mayn't we have been certificating?
mayn't you have been certificating?
mayn't they have been certificating?