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 could not unbar you could not unbar he could not unbar we could not unbar you could not unbar they could not unbar
V-ing form
I could not be unbarring you could not be unbarring he could not be unbarring we could not be unbarring you could not be unbarring they could not be unbarring
Perfect
I could not have unbarred you could not have unbarred he could not have unbarred we could not have unbarred you could not have unbarred they could not have unbarred
V-ing perfect
I could not have been unbarring you could not have been unbarring he could not have been unbarring we could not have been unbarring you could not have been unbarring they could not 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
could I not unbar? could you not unbar? could he not unbar? could we not unbar? could you not unbar? could they not unbar?
V-ing form
could I not be unbarring? could you not be unbarring? could he not be unbarring? could we not be unbarring? could you not be unbarring? could they not be unbarring?
Perfect
could I not have unbarred? could you not have unbarred? could he not have unbarred? could we not have unbarred? could you not have unbarred? could they not have unbarred?
V-ing perfect
could I not have been unbarring? could you not have been unbarring? could he not have been unbarring? could we not have been unbarring? could you not have been unbarring? could they not have been unbarring?