I could underemphasize you could underemphasize she could underemphasize we could underemphasize you could underemphasize they could underemphasize
V-ing form
I could be underemphasizing you could be underemphasizing she could be underemphasizing we could be underemphasizing you could be underemphasizing they could be underemphasizing
Perfect
I could have underemphasized you could have underemphasized she could have underemphasized we could have underemphasized you could have underemphasized they could have underemphasized
V-ing perfect
I could have been underemphasizing you could have been underemphasizing she could have been underemphasizing we could have been underemphasizing you could have been underemphasizing they could have been underemphasizing
Negation
Simple form
I could not underemphasize you could not underemphasize she could not underemphasize we could not underemphasize you could not underemphasize they could not underemphasize
V-ing form
I could not be underemphasizing you could not be underemphasizing she could not be underemphasizing we could not be underemphasizing you could not be underemphasizing they could not be underemphasizing
Perfect
I could not have underemphasized you could not have underemphasized she could not have underemphasized we could not have underemphasized you could not have underemphasized they could not have underemphasized
V-ing perfect
I could not have been underemphasizing you could not have been underemphasizing she could not have been underemphasizing we could not have been underemphasizing you could not have been underemphasizing they could not have been underemphasizing
Interrogative form
Simple form
could I underemphasize? could you underemphasize? could she underemphasize? could we underemphasize? could you underemphasize? could they underemphasize?
V-ing form
could I be underemphasizing? could you be underemphasizing? could she be underemphasizing? could we be underemphasizing? could you be underemphasizing? could they be underemphasizing?
Perfect
could I have underemphasized? could you have underemphasized? could she have underemphasized? could we have underemphasized? could you have underemphasized? could they have underemphasized?
V-ing perfect
could I have been underemphasizing? could you have been underemphasizing? could she have been underemphasizing? could we have been underemphasizing? could you have been underemphasizing? could they have been underemphasizing?
Interro-negative form
Simple form
could I not underemphasize? could you not underemphasize? could she not underemphasize? could we not underemphasize? could you not underemphasize? could they not underemphasize?
V-ing form
could I not be underemphasizing? could you not be underemphasizing? could she not be underemphasizing? could we not be underemphasizing? could you not be underemphasizing? could they not be underemphasizing?
Perfect
could I not have underemphasized? could you not have underemphasized? could she not have underemphasized? could we not have underemphasized? could you not have underemphasized? could they not have underemphasized?
V-ing perfect
could I not have been underemphasizing? could you not have been underemphasizing? could she not have been underemphasizing? could we not have been underemphasizing? could you not have been underemphasizing? could they not have been underemphasizing?