English verb conjugation
COULD UNSEAL

Regular verb: unseal - unsealed - unsealed

Affirmation

Simple form	V-ing form
I could unseal you could unseal she could unseal we could unseal you could unseal they could unseal	I could be unsealing you could be unsealing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she unseal? could we unseal? could you unseal? could they unseal?	could I be unsealing? could you be unsealing? could she 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 she 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 she 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 she 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 she 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 she 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 she have been unsealing? couldn't we have been unsealing? couldn't you have been unsealing? couldn't they have been unsealing?