English verb conjugation
COULD UNDERSEAL

Regular verb: underseal - undersealed - undersealed

Affirmation

Simple form	V-ing form
I could underseal you could underseal he could underseal we could underseal you could underseal they could underseal	I could be undersealing you could be undersealing he could be undersealing we could be undersealing you could be undersealing they could be undersealing
Perfect	V-ing perfect
I could have undersealed you could have undersealed he could have undersealed we could have undersealed you could have undersealed they could have undersealed	I could have been undersealing you could have been undersealing he could have been undersealing we could have been undersealing you could have been undersealing they could have been undersealing

Negation

Simple form	V-ing form
I could not underseal you could not underseal he could not underseal we could not underseal you could not underseal they could not underseal	I could not be undersealing you could not be undersealing he could not be undersealing we could not be undersealing you could not be undersealing they could not be undersealing
Perfect	V-ing perfect
I could not have undersealed you could not have undersealed he could not have undersealed we could not have undersealed you could not have undersealed they could not have undersealed	I could not have been undersealing you could not have been undersealing he could not have been undersealing we could not have been undersealing you could not have been undersealing they could not have been undersealing

Interrogative form

Simple form	V-ing form
could I underseal? could you underseal? could he underseal? could we underseal? could you underseal? could they underseal?	could I be undersealing? could you be undersealing? could he be undersealing? could we be undersealing? could you be undersealing? could they be undersealing?
Perfect	V-ing perfect
could I have undersealed? could you have undersealed? could he have undersealed? could we have undersealed? could you have undersealed? could they have undersealed?	could I have been undersealing? could you have been undersealing? could he have been undersealing? could we have been undersealing? could you have been undersealing? could they have been undersealing?

Interro-negative form

Simple form	V-ing form
could I not underseal? could you not underseal? could he not underseal? could we not underseal? could you not underseal? could they not underseal?	could I not be undersealing? could you not be undersealing? could he not be undersealing? could we not be undersealing? could you not be undersealing? could they not be undersealing?
Perfect	V-ing perfect
could I not have undersealed? could you not have undersealed? could he not have undersealed? could we not have undersealed? could you not have undersealed? could they not have undersealed?	could I not have been undersealing? could you not have been undersealing? could he not have been undersealing? could we not have been undersealing? could you not have been undersealing? could they not have been undersealing?