I could prune you could prune she could prune we could prune you could prune they could prune
V-ing form
I could be pruning you could be pruning she could be pruning we could be pruning you could be pruning they could be pruning
Perfect
I could have pruned you could have pruned she could have pruned we could have pruned you could have pruned they could have pruned
V-ing perfect
I could have been pruning you could have been pruning she could have been pruning we could have been pruning you could have been pruning they could have been pruning
Negation
Simple form
I couldn't prune you couldn't prune she couldn't prune we couldn't prune you couldn't prune they couldn't prune
V-ing form
I couldn't be pruning you couldn't be pruning she couldn't be pruning we couldn't be pruning you couldn't be pruning they couldn't be pruning
Perfect
I couldn't have pruned you couldn't have pruned she couldn't have pruned we couldn't have pruned you couldn't have pruned they couldn't have pruned
V-ing perfect
I couldn't have been pruning you couldn't have been pruning she couldn't have been pruning we couldn't have been pruning you couldn't have been pruning they couldn't have been pruning
Interrogative form
Simple form
could I prune? could you prune? could she prune? could we prune? could you prune? could they prune?
V-ing form
could I be pruning? could you be pruning? could she be pruning? could we be pruning? could you be pruning? could they be pruning?
Perfect
could I have pruned? could you have pruned? could she have pruned? could we have pruned? could you have pruned? could they have pruned?
V-ing perfect
could I have been pruning? could you have been pruning? could she have been pruning? could we have been pruning? could you have been pruning? could they have been pruning?
Interro-negative form
Simple form
couldn't I prune? couldn't you prune? couldn't she prune? couldn't we prune? couldn't you prune? couldn't they prune?
V-ing form
couldn't I be pruning? couldn't you be pruning? couldn't she be pruning? couldn't we be pruning? couldn't you be pruning? couldn't they be pruning?
Perfect
couldn't I have pruned? couldn't you have pruned? couldn't she have pruned? couldn't we have pruned? couldn't you have pruned? couldn't they have pruned?
V-ing perfect
couldn't I have been pruning? couldn't you have been pruning? couldn't she have been pruning? couldn't we have been pruning? couldn't you have been pruning? couldn't they have been pruning?