I can cancel you can cancel he can cancel we can cancel you can cancel they can cancel
V-ing form
I can be cancelling you can be cancelling he can be cancelling we can be cancelling you can be cancelling they can be cancelling
Perfect
I can have cancelled you can have cancelled he can have cancelled we can have cancelled you can have cancelled they can have cancelled
V-ing perfect
I can have been cancelling you can have been cancelling he can have been cancelling we can have been cancelling you can have been cancelling they can have been cancelling
Negation
Simple form
I cannot cancel you cannot cancel he cannot cancel we cannot cancel you cannot cancel they cannot cancel
V-ing form
I cannot be cancelling you cannot be cancelling he cannot be cancelling we cannot be cancelling you cannot be cancelling they cannot be cancelling
Perfect
I cannot have cancelled you cannot have cancelled he cannot have cancelled we cannot have cancelled you cannot have cancelled they cannot have cancelled
V-ing perfect
I cannot have been cancelling you cannot have been cancelling he cannot have been cancelling we cannot have been cancelling you cannot have been cancelling they cannot have been cancelling
Interrogative form
Simple form
can I cancel? can you cancel? can he cancel? can we cancel? can you cancel? can they cancel?
V-ing form
can I be cancelling? can you be cancelling? can he be cancelling? can we be cancelling? can you be cancelling? can they be cancelling?
Perfect
can I have cancelled? can you have cancelled? can he have cancelled? can we have cancelled? can you have cancelled? can they have cancelled?
V-ing perfect
can I have been cancelling? can you have been cancelling? can he have been cancelling? can we have been cancelling? can you have been cancelling? can they have been cancelling?
Interro-negative form
Simple form
can I not cancel? can you not cancel? can he not cancel? can we not cancel? can you not cancel? can they not cancel?
V-ing form
can I not be cancelling? can you not be cancelling? can he not be cancelling? can we not be cancelling? can you not be cancelling? can they not be cancelling?
Perfect
can I not have cancelled? can you not have cancelled? can he not have cancelled? can we not have cancelled? can you not have cancelled? can they not have cancelled?
V-ing perfect
can I not have been cancelling? can you not have been cancelling? can he not have been cancelling? can we not have been cancelling? can you not have been cancelling? can they not have been cancelling?