English verb conjugation
SHOULD UNDERESTIMATE

Regular verb: underestimate - underestimated - underestimated

Affirmation

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

Negation

Simple form	V-ing form
I should not underestimate you should not underestimate he should not underestimate we should not underestimate you should not underestimate they should not underestimate	I should not be underestimating you should not be underestimating he should not be underestimating we should not be underestimating you should not be underestimating they should not be underestimating
Perfect	V-ing perfect
I should not have underestimated you should not have underestimated he should not have underestimated we should not have underestimated you should not have underestimated they should not have underestimated	I should not have been underestimating you should not have been underestimating he should not have been underestimating we should not have been underestimating you should not have been underestimating they should not have been underestimating

Interrogative form

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

Interro-negative form

Simple form	V-ing form
should I not underestimate? should you not underestimate? should he not underestimate? should we not underestimate? should you not underestimate? should they not underestimate?	should I not be underestimating? should you not be underestimating? should he not be underestimating? should we not be underestimating? should you not be underestimating? should they not be underestimating?
Perfect	V-ing perfect
should I not have underestimated? should you not have underestimated? should he not have underestimated? should we not have underestimated? should you not have underestimated? should they not have underestimated?	should I not have been underestimating? should you not have been underestimating? should he not have been underestimating? should we not have been underestimating? should you not have been underestimating? should they not have been underestimating?