I should underestimate you should underestimate he should underestimate we should underestimate you should underestimate they should underestimate
V-ing form
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
I should have underestimated you should have underestimated he should have underestimated we should have underestimated you should have underestimated they should have underestimated
V-ing perfect
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
I should not underestimate you should not underestimate he should not underestimate we should not underestimate you should not underestimate they should not underestimate
V-ing form
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
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
V-ing perfect
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
should I underestimate? should you underestimate? should he underestimate? should we underestimate? should you underestimate? should they underestimate?
V-ing form
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
should I have underestimated? should you have underestimated? should he have underestimated? should we have underestimated? should you have underestimated? should they have underestimated?
V-ing perfect
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
should I not underestimate? should you not underestimate? should he not underestimate? should we not underestimate? should you not underestimate? should they not underestimate?
V-ing form
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
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?
V-ing perfect
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?