may understudy
Regular verb: understudy - understudied- understudied

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may understudy
you may understudy
she may understudy
we may understudy
you may understudy
they may understudy 	I may be understudying
you may be understudying
she may be understudying
we may be understudying
you may be understudying
they may be understudying	I may have understudied
you may have understudied
she may have understudied
we may have understudied
you may have understudied
they may have understudied	I may have been understudying
you may have been understudying
she may have been understudying
we may have been understudying
you may have been understudying
they may have been understudying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't understudy
you mayn't understudy
she mayn't understudy
we mayn't understudy
you mayn't understudy
they mayn't understudy 	I mayn't be understudying
you mayn't be understudying
she mayn't be understudying
we mayn't be understudying
you mayn't be understudying
they mayn't be understudying	I mayn't have understudied
you mayn't have understudied
she mayn't have understudied
we mayn't have understudied
you mayn't have understudied
they mayn't have understudied	I mayn't have been understudying
you mayn't have been understudying
she mayn't have been understudying
we mayn't have been understudying
you mayn't have been understudying
they mayn't have been understudying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I understudy?
may you understudy?
may she understudy?
may we understudy?
may you understudy?
may they understudy? 	may I be understudying?
may you be understudying?
may she be understudying?
may we be understudying?
may you be understudying?
may they be understudying? 	may I have understudied?
may you have understudied?
may she have understudied?
may we have understudied?
may you have understudied?
may they have understudied? 	may I have been understudying?
may you have been understudying?
may she have been understudying?
may we have been understudying?
may you have been understudying?
may they have been understudying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I understudy?
mayn't you understudy?
mayn't she understudy?
mayn't we understudy?
mayn't you understudy?
mayn't they understudy? 	mayn't I be understudying?
mayn't you be understudying?
mayn't she be understudying?
mayn't we be understudying?
mayn't you be understudying?
mayn't they be understudying? 	mayn't I have understudied?
mayn't you have understudied?
mayn't she have understudied?
mayn't we have understudied?
mayn't you have understudied?
mayn't they have understudied? 	mayn't I have been understudying?
mayn't you have been understudying?
mayn't she have been understudying?
mayn't we have been understudying?
mayn't you have been understudying?
mayn't they have been understudying?