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 may not grump
you may not grump
she may not grump
we may not grump
you may not grump
they may not grump 	I may not be grumping
you may not be grumping
she may not be grumping
we may not be grumping
you may not be grumping
they may not be grumping	I may not have grumped
you may not have grumped
she may not have grumped
we may not have grumped
you may not have grumped
they may not have grumped	I may not have been grumping
you may not have been grumping
she may not have been grumping
we may not have been grumping
you may not have been grumping
they may not 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 	
may I not grump?
may you not grump?
may she not grump?
may we not grump?
may you not grump?
may they not grump? 	may I not be grumping?
may you not be grumping?
may she not be grumping?
may we not be grumping?
may you not be grumping?
may they not be grumping? 	may I not have grumped?
may you not have grumped?
may she not have grumped?
may we not have grumped?
may you not have grumped?
may they not have grumped? 	may I not have been grumping?
may you not have been grumping?
may she not have been grumping?
may we not have been grumping?
may you not have been grumping?
may they not have been grumping?