I can unseal you can unseal he can unseal we can unseal you can unseal they can unseal
V-ing form
I can be unsealing you can be unsealing he can be unsealing we can be unsealing you can be unsealing they can be unsealing
Perfect
I can have unsealed you can have unsealed he can have unsealed we can have unsealed you can have unsealed they can have unsealed
V-ing perfect
I can have been unsealing you can have been unsealing he can have been unsealing we can have been unsealing you can have been unsealing they can have been unsealing
Negation
Simple form
I cannot unseal you cannot unseal he cannot unseal we cannot unseal you cannot unseal they cannot unseal
V-ing form
I cannot be unsealing you cannot be unsealing he cannot be unsealing we cannot be unsealing you cannot be unsealing they cannot be unsealing
Perfect
I cannot have unsealed you cannot have unsealed he cannot have unsealed we cannot have unsealed you cannot have unsealed they cannot have unsealed
V-ing perfect
I cannot have been unsealing you cannot have been unsealing he cannot have been unsealing we cannot have been unsealing you cannot have been unsealing they cannot have been unsealing
Interrogative form
Simple form
can I unseal? can you unseal? can he unseal? can we unseal? can you unseal? can they unseal?
V-ing form
can I be unsealing? can you be unsealing? can he be unsealing? can we be unsealing? can you be unsealing? can they be unsealing?
Perfect
can I have unsealed? can you have unsealed? can he have unsealed? can we have unsealed? can you have unsealed? can they have unsealed?
V-ing perfect
can I have been unsealing? can you have been unsealing? can he have been unsealing? can we have been unsealing? can you have been unsealing? can they have been unsealing?
Interro-negative form
Simple form
can I not unseal? can you not unseal? can he not unseal? can we not unseal? can you not unseal? can they not unseal?
V-ing form
can I not be unsealing? can you not be unsealing? can he not be unsealing? can we not be unsealing? can you not be unsealing? can they not be unsealing?
Perfect
can I not have unsealed? can you not have unsealed? can he not have unsealed? can we not have unsealed? can you not have unsealed? can they not have unsealed?
V-ing perfect
can I not have been unsealing? can you not have been unsealing? can he not have been unsealing? can we not have been unsealing? can you not have been unsealing? can they not have been unsealing?