I can unbar you can unbar he can unbar we can unbar you can unbar they can unbar
V-ing form
I can be unbarring you can be unbarring he can be unbarring we can be unbarring you can be unbarring they can be unbarring
Perfect
I can have unbarred you can have unbarred he can have unbarred we can have unbarred you can have unbarred they can have unbarred
V-ing perfect
I can have been unbarring you can have been unbarring he can have been unbarring we can have been unbarring you can have been unbarring they can have been unbarring
Negation
Simple form
I cannot unbar you cannot unbar he cannot unbar we cannot unbar you cannot unbar they cannot unbar
V-ing form
I cannot be unbarring you cannot be unbarring he cannot be unbarring we cannot be unbarring you cannot be unbarring they cannot be unbarring
Perfect
I cannot have unbarred you cannot have unbarred he cannot have unbarred we cannot have unbarred you cannot have unbarred they cannot have unbarred
V-ing perfect
I cannot have been unbarring you cannot have been unbarring he cannot have been unbarring we cannot have been unbarring you cannot have been unbarring they cannot have been unbarring
Interrogative form
Simple form
can I unbar? can you unbar? can he unbar? can we unbar? can you unbar? can they unbar?
V-ing form
can I be unbarring? can you be unbarring? can he be unbarring? can we be unbarring? can you be unbarring? can they be unbarring?
Perfect
can I have unbarred? can you have unbarred? can he have unbarred? can we have unbarred? can you have unbarred? can they have unbarred?
V-ing perfect
can I have been unbarring? can you have been unbarring? can he have been unbarring? can we have been unbarring? can you have been unbarring? can they have been unbarring?
Interro-negative form
Simple form
can I not unbar? can you not unbar? can he not unbar? can we not unbar? can you not unbar? can they not unbar?
V-ing form
can I not be unbarring? can you not be unbarring? can he not be unbarring? can we not be unbarring? can you not be unbarring? can they not be unbarring?
Perfect
can I not have unbarred? can you not have unbarred? can he not have unbarred? can we not have unbarred? can you not have unbarred? can they not have unbarred?
V-ing perfect
can I not have been unbarring? can you not have been unbarring? can he not have been unbarring? can we not have been unbarring? can you not have been unbarring? can they not have been unbarring?