may grump
Regular verb: grump - grumped- grumped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may grump
you may grump
she may grump
we may grump
you may grump
they may grump 	I may be grumping
you may be grumping
she may be grumping
we may be grumping
you may be grumping
they may be grumping	I may have grumped
you may have grumped
she may have grumped
we may have grumped
you may have grumped
they may have grumped	I may have been grumping
you may have been grumping
she may have been grumping
we may have been grumping
you may have been grumping
they may have been grumping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't grump
you mayn't grump
she mayn't grump
we mayn't grump
you mayn't grump
they mayn't grump 	I mayn't be grumping
you mayn't be grumping
she mayn't be grumping
we mayn't be grumping
you mayn't be grumping
they mayn't be grumping	I mayn't have grumped
you mayn't have grumped
she mayn't have grumped
we mayn't have grumped
you mayn't have grumped
they mayn't have grumped	I mayn't have been grumping
you mayn't have been grumping
she mayn't have been grumping
we mayn't have been grumping
you mayn't have been grumping
they mayn't have been grumping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I grump?
may you grump?
may she grump?
may we grump?
may you grump?
may they grump? 	may I be grumping?
may you be grumping?
may she be grumping?
may we be grumping?
may you be grumping?
may they be grumping? 	may I have grumped?
may you have grumped?
may she have grumped?
may we have grumped?
may you have grumped?
may they have grumped? 	may I have been grumping?
may you have been grumping?
may she have been grumping?
may we have been grumping?
may you have been grumping?
may they have been grumping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I grump?
mayn't you grump?
mayn't she grump?
mayn't we grump?
mayn't you grump?
mayn't they grump? 	mayn't I be grumping?
mayn't you be grumping?
mayn't she be grumping?
mayn't we be grumping?
mayn't you be grumping?
mayn't they be grumping? 	mayn't I have grumped?
mayn't you have grumped?
mayn't she have grumped?
mayn't we have grumped?
mayn't you have grumped?
mayn't they have grumped? 	mayn't I have been grumping?
mayn't you have been grumping?
mayn't she have been grumping?
mayn't we have been grumping?
mayn't you have been grumping?
mayn't they have been grumping?