may crib
Regular verb: crib - cribbed- cribbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may crib
you may crib
he may crib
we may crib
you may crib
they may crib 	I may be cribbing
you may be cribbing
he may be cribbing
we may be cribbing
you may be cribbing
they may be cribbing	I may have cribbed
you may have cribbed
he may have cribbed
we may have cribbed
you may have cribbed
they may have cribbed	I may have been cribbing
you may have been cribbing
he may have been cribbing
we may have been cribbing
you may have been cribbing
they may have been cribbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't crib
you mayn't crib
he mayn't crib
we mayn't crib
you mayn't crib
they mayn't crib 	I mayn't be cribbing
you mayn't be cribbing
he mayn't be cribbing
we mayn't be cribbing
you mayn't be cribbing
they mayn't be cribbing	I mayn't have cribbed
you mayn't have cribbed
he mayn't have cribbed
we mayn't have cribbed
you mayn't have cribbed
they mayn't have cribbed	I mayn't have been cribbing
you mayn't have been cribbing
he mayn't have been cribbing
we mayn't have been cribbing
you mayn't have been cribbing
they mayn't have been cribbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I crib?
may you crib?
may he crib?
may we crib?
may you crib?
may they crib? 	may I be cribbing?
may you be cribbing?
may he be cribbing?
may we be cribbing?
may you be cribbing?
may they be cribbing? 	may I have cribbed?
may you have cribbed?
may he have cribbed?
may we have cribbed?
may you have cribbed?
may they have cribbed? 	may I have been cribbing?
may you have been cribbing?
may he have been cribbing?
may we have been cribbing?
may you have been cribbing?
may they have been cribbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I crib?
mayn't you crib?
mayn't he crib?
mayn't we crib?
mayn't you crib?
mayn't they crib? 	mayn't I be cribbing?
mayn't you be cribbing?
mayn't he be cribbing?
mayn't we be cribbing?
mayn't you be cribbing?
mayn't they be cribbing? 	mayn't I have cribbed?
mayn't you have cribbed?
mayn't he have cribbed?
mayn't we have cribbed?
mayn't you have cribbed?
mayn't they have cribbed? 	mayn't I have been cribbing?
mayn't you have been cribbing?
mayn't he have been cribbing?
mayn't we have been cribbing?
mayn't you have been cribbing?
mayn't they have been cribbing?