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