English verb conjugation
COULD UNSEAL

Regular verb: unseal - unsealed - unsealed

Affirmation

Simple form	V-ing form
I could unseal you could unseal he could unseal we could unseal you could unseal they could unseal	I could be unsealing you could be unsealing he could be unsealing we could be unsealing you could be unsealing they could be unsealing
Perfect	V-ing perfect
I could have unsealed you could have unsealed he could have unsealed we could have unsealed you could have unsealed they could have unsealed	I could have been unsealing you could have been unsealing he could have been unsealing we could have been unsealing you could have been unsealing they could have been unsealing

Negation

Simple form	V-ing form
I couldn't unseal you couldn't unseal he couldn't unseal we couldn't unseal you couldn't unseal they couldn't unseal	I couldn't be unsealing you couldn't be unsealing he couldn't be unsealing we couldn't be unsealing you couldn't be unsealing they couldn't be unsealing
Perfect	V-ing perfect
I couldn't have unsealed you couldn't have unsealed he couldn't have unsealed we couldn't have unsealed you couldn't have unsealed they couldn't have unsealed	I couldn't have been unsealing you couldn't have been unsealing he couldn't have been unsealing we couldn't have been unsealing you couldn't have been unsealing they couldn't have been unsealing

Interrogative form

Simple form	V-ing form
could I unseal? could you unseal? could he unseal? could we unseal? could you unseal? could they unseal?	could I be unsealing? could you be unsealing? could he be unsealing? could we be unsealing? could you be unsealing? could they be unsealing?
Perfect	V-ing perfect
could I have unsealed? could you have unsealed? could he have unsealed? could we have unsealed? could you have unsealed? could they have unsealed?	could I have been unsealing? could you have been unsealing? could he have been unsealing? could we have been unsealing? could you have been unsealing? could they have been unsealing?

Interro-negative form

Simple form	V-ing form
couldn't I unseal? couldn't you unseal? couldn't he unseal? couldn't we unseal? couldn't you unseal? couldn't they unseal?	couldn't I be unsealing? couldn't you be unsealing? couldn't he be unsealing? couldn't we be unsealing? couldn't you be unsealing? couldn't they be unsealing?
Perfect	V-ing perfect
couldn't I have unsealed? couldn't you have unsealed? couldn't he have unsealed? couldn't we have unsealed? couldn't you have unsealed? couldn't they have unsealed?	couldn't I have been unsealing? couldn't you have been unsealing? couldn't he have been unsealing? couldn't we have been unsealing? couldn't you have been unsealing? couldn't they have been unsealing?