may underestimate
Regular verb: underestimate - underestimated- underestimated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may underestimate
you may underestimate
he may underestimate
we may underestimate
you may underestimate
they may underestimate 	I may be underestimating
you may be underestimating
he may be underestimating
we may be underestimating
you may be underestimating
they may be underestimating	I may have underestimated
you may have underestimated
he may have underestimated
we may have underestimated
you may have underestimated
they may have underestimated	I may have been underestimating
you may have been underestimating
he may have been underestimating
we may have been underestimating
you may have been underestimating
they may have been underestimating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't underestimate
you mayn't underestimate
he mayn't underestimate
we mayn't underestimate
you mayn't underestimate
they mayn't underestimate 	I mayn't be underestimating
you mayn't be underestimating
he mayn't be underestimating
we mayn't be underestimating
you mayn't be underestimating
they mayn't be underestimating	I mayn't have underestimated
you mayn't have underestimated
he mayn't have underestimated
we mayn't have underestimated
you mayn't have underestimated
they mayn't have underestimated	I mayn't have been underestimating
you mayn't have been underestimating
he mayn't have been underestimating
we mayn't have been underestimating
you mayn't have been underestimating
they mayn't have been underestimating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I underestimate?
may you underestimate?
may he underestimate?
may we underestimate?
may you underestimate?
may they underestimate? 	may I be underestimating?
may you be underestimating?
may he be underestimating?
may we be underestimating?
may you be underestimating?
may they be underestimating? 	may I have underestimated?
may you have underestimated?
may he have underestimated?
may we have underestimated?
may you have underestimated?
may they have underestimated? 	may I have been underestimating?
may you have been underestimating?
may he have been underestimating?
may we have been underestimating?
may you have been underestimating?
may they have been underestimating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I underestimate?
mayn't you underestimate?
mayn't he underestimate?
mayn't we underestimate?
mayn't you underestimate?
mayn't they underestimate? 	mayn't I be underestimating?
mayn't you be underestimating?
mayn't he be underestimating?
mayn't we be underestimating?
mayn't you be underestimating?
mayn't they be underestimating? 	mayn't I have underestimated?
mayn't you have underestimated?
mayn't he have underestimated?
mayn't we have underestimated?
mayn't you have underestimated?
mayn't they have underestimated? 	mayn't I have been underestimating?
mayn't you have been underestimating?
mayn't he have been underestimating?
mayn't we have been underestimating?
mayn't you have been underestimating?
mayn't they have been underestimating?