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