may sub
Regular verb: sub - subbed- subbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may sub
you may sub
she may sub
we may sub
you may sub
they may sub 	I may be subbing
you may be subbing
she may be subbing
we may be subbing
you may be subbing
they may be subbing	I may have subbed
you may have subbed
she may have subbed
we may have subbed
you may have subbed
they may have subbed	I may have been subbing
you may have been subbing
she may have been subbing
we may have been subbing
you may have been subbing
they may have been subbing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't sub
you mayn't sub
she mayn't sub
we mayn't sub
you mayn't sub
they mayn't sub 	I mayn't be subbing
you mayn't be subbing
she mayn't be subbing
we mayn't be subbing
you mayn't be subbing
they mayn't be subbing	I mayn't have subbed
you mayn't have subbed
she mayn't have subbed
we mayn't have subbed
you mayn't have subbed
they mayn't have subbed	I mayn't have been subbing
you mayn't have been subbing
she mayn't have been subbing
we mayn't have been subbing
you mayn't have been subbing
they mayn't have been subbing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I sub?
may you sub?
may she sub?
may we sub?
may you sub?
may they sub? 	may I be subbing?
may you be subbing?
may she be subbing?
may we be subbing?
may you be subbing?
may they be subbing? 	may I have subbed?
may you have subbed?
may she have subbed?
may we have subbed?
may you have subbed?
may they have subbed? 	may I have been subbing?
may you have been subbing?
may she have been subbing?
may we have been subbing?
may you have been subbing?
may they have been subbing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I sub?
mayn't you sub?
mayn't she sub?
mayn't we sub?
mayn't you sub?
mayn't they sub? 	mayn't I be subbing?
mayn't you be subbing?
mayn't she be subbing?
mayn't we be subbing?
mayn't you be subbing?
mayn't they be subbing? 	mayn't I have subbed?
mayn't you have subbed?
mayn't she have subbed?
mayn't we have subbed?
mayn't you have subbed?
mayn't they have subbed? 	mayn't I have been subbing?
mayn't you have been subbing?
mayn't she have been subbing?
mayn't we have been subbing?
mayn't you have been subbing?
mayn't they have been subbing?