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