English verb conjugation
CAN UNDERESTIMATE

Regular verb: underestimate - underestimated - underestimated

Affirmation

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