English verb conjugation
COULD UNDERSEAL

Regular verb: underseal - undersealed - undersealed

Affirmation

Simple form	V-ing form
I could underseal you could underseal she could underseal we could underseal you could underseal they could underseal	I could be undersealing you could be undersealing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she underseal? could we underseal? could you underseal? could they underseal?	could I be undersealing? could you be undersealing? could she 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 she 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 she 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 she 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 she 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 she 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 she not have been undersealing? could we not have been undersealing? could you not have been undersealing? could they not have been undersealing?