might underestimate
Regular verb: underestimate - underestimated- underestimated

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

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

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

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