may unbuckle
Regular verb: unbuckle - unbuckled- unbuckled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may unbuckle
you may unbuckle
she may unbuckle
we may unbuckle
you may unbuckle
they may unbuckle 	I may be unbuckling
you may be unbuckling
she may be unbuckling
we may be unbuckling
you may be unbuckling
they may be unbuckling	I may have unbuckled
you may have unbuckled
she may have unbuckled
we may have unbuckled
you may have unbuckled
they may have unbuckled	I may have been unbuckling
you may have been unbuckling
she may have been unbuckling
we may have been unbuckling
you may have been unbuckling
they may have been unbuckling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't unbuckle
you mayn't unbuckle
she mayn't unbuckle
we mayn't unbuckle
you mayn't unbuckle
they mayn't unbuckle 	I mayn't be unbuckling
you mayn't be unbuckling
she mayn't be unbuckling
we mayn't be unbuckling
you mayn't be unbuckling
they mayn't be unbuckling	I mayn't have unbuckled
you mayn't have unbuckled
she mayn't have unbuckled
we mayn't have unbuckled
you mayn't have unbuckled
they mayn't have unbuckled	I mayn't have been unbuckling
you mayn't have been unbuckling
she mayn't have been unbuckling
we mayn't have been unbuckling
you mayn't have been unbuckling
they mayn't have been unbuckling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I unbuckle?
may you unbuckle?
may she unbuckle?
may we unbuckle?
may you unbuckle?
may they unbuckle? 	may I be unbuckling?
may you be unbuckling?
may she be unbuckling?
may we be unbuckling?
may you be unbuckling?
may they be unbuckling? 	may I have unbuckled?
may you have unbuckled?
may she have unbuckled?
may we have unbuckled?
may you have unbuckled?
may they have unbuckled? 	may I have been unbuckling?
may you have been unbuckling?
may she have been unbuckling?
may we have been unbuckling?
may you have been unbuckling?
may they have been unbuckling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I unbuckle?
mayn't you unbuckle?
mayn't she unbuckle?
mayn't we unbuckle?
mayn't you unbuckle?
mayn't they unbuckle? 	mayn't I be unbuckling?
mayn't you be unbuckling?
mayn't she be unbuckling?
mayn't we be unbuckling?
mayn't you be unbuckling?
mayn't they be unbuckling? 	mayn't I have unbuckled?
mayn't you have unbuckled?
mayn't she have unbuckled?
mayn't we have unbuckled?
mayn't you have unbuckled?
mayn't they have unbuckled? 	mayn't I have been unbuckling?
mayn't you have been unbuckling?
mayn't she have been unbuckling?
mayn't we have been unbuckling?
mayn't you have been unbuckling?
mayn't they have been unbuckling?