can underestimate
Regular verb: underestimate - underestimated- underestimated

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

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

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

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