may drub
Regular verb: drub - drubbed- drubbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may drub
you may drub
he may drub
we may drub
you may drub
they may drub 	I may be drubbing
you may be drubbing
he may be drubbing
we may be drubbing
you may be drubbing
they may be drubbing	I may have drubbed
you may have drubbed
he may have drubbed
we may have drubbed
you may have drubbed
they may have drubbed	I may have been drubbing
you may have been drubbing
he may have been drubbing
we may have been drubbing
you may have been drubbing
they may have been drubbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't drub
you mayn't drub
he mayn't drub
we mayn't drub
you mayn't drub
they mayn't drub 	I mayn't be drubbing
you mayn't be drubbing
he mayn't be drubbing
we mayn't be drubbing
you mayn't be drubbing
they mayn't be drubbing	I mayn't have drubbed
you mayn't have drubbed
he mayn't have drubbed
we mayn't have drubbed
you mayn't have drubbed
they mayn't have drubbed	I mayn't have been drubbing
you mayn't have been drubbing
he mayn't have been drubbing
we mayn't have been drubbing
you mayn't have been drubbing
they mayn't have been drubbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I drub?
may you drub?
may he drub?
may we drub?
may you drub?
may they drub? 	may I be drubbing?
may you be drubbing?
may he be drubbing?
may we be drubbing?
may you be drubbing?
may they be drubbing? 	may I have drubbed?
may you have drubbed?
may he have drubbed?
may we have drubbed?
may you have drubbed?
may they have drubbed? 	may I have been drubbing?
may you have been drubbing?
may he have been drubbing?
may we have been drubbing?
may you have been drubbing?
may they have been drubbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I drub?
mayn't you drub?
mayn't he drub?
mayn't we drub?
mayn't you drub?
mayn't they drub? 	mayn't I be drubbing?
mayn't you be drubbing?
mayn't he be drubbing?
mayn't we be drubbing?
mayn't you be drubbing?
mayn't they be drubbing? 	mayn't I have drubbed?
mayn't you have drubbed?
mayn't he have drubbed?
mayn't we have drubbed?
mayn't you have drubbed?
mayn't they have drubbed? 	mayn't I have been drubbing?
mayn't you have been drubbing?
mayn't he have been drubbing?
mayn't we have been drubbing?
mayn't you have been drubbing?
mayn't they have been drubbing?