I could archive you could archive he could archive we could archive you could archive they could archive
V-ing form
I could be archiving you could be archiving he could be archiving we could be archiving you could be archiving they could be archiving
Perfect
I could have archived you could have archived he could have archived we could have archived you could have archived they could have archived
V-ing perfect
I could have been archiving you could have been archiving he could have been archiving we could have been archiving you could have been archiving they could have been archiving
Negation
Simple form
I couldn't archive you couldn't archive he couldn't archive we couldn't archive you couldn't archive they couldn't archive
V-ing form
I couldn't be archiving you couldn't be archiving he couldn't be archiving we couldn't be archiving you couldn't be archiving they couldn't be archiving
Perfect
I couldn't have archived you couldn't have archived he couldn't have archived we couldn't have archived you couldn't have archived they couldn't have archived
V-ing perfect
I couldn't have been archiving you couldn't have been archiving he couldn't have been archiving we couldn't have been archiving you couldn't have been archiving they couldn't have been archiving
Interrogative form
Simple form
could I archive? could you archive? could he archive? could we archive? could you archive? could they archive?
V-ing form
could I be archiving? could you be archiving? could he be archiving? could we be archiving? could you be archiving? could they be archiving?
Perfect
could I have archived? could you have archived? could he have archived? could we have archived? could you have archived? could they have archived?
V-ing perfect
could I have been archiving? could you have been archiving? could he have been archiving? could we have been archiving? could you have been archiving? could they have been archiving?
Interro-negative form
Simple form
couldn't I archive? couldn't you archive? couldn't he archive? couldn't we archive? couldn't you archive? couldn't they archive?
V-ing form
couldn't I be archiving? couldn't you be archiving? couldn't he be archiving? couldn't we be archiving? couldn't you be archiving? couldn't they be archiving?
Perfect
couldn't I have archived? couldn't you have archived? couldn't he have archived? couldn't we have archived? couldn't you have archived? couldn't they have archived?
V-ing perfect
couldn't I have been archiving? couldn't you have been archiving? couldn't he have been archiving? couldn't we have been archiving? couldn't you have been archiving? couldn't they have been archiving?