I can calender you can calender he can calender we can calender you can calender they can calender
V-ing form
I can be calendering you can be calendering he can be calendering we can be calendering you can be calendering they can be calendering
Perfect
I can have calendered you can have calendered he can have calendered we can have calendered you can have calendered they can have calendered
V-ing perfect
I can have been calendering you can have been calendering he can have been calendering we can have been calendering you can have been calendering they can have been calendering
Negation
Simple form
I cannot calender you cannot calender he cannot calender we cannot calender you cannot calender they cannot calender
V-ing form
I cannot be calendering you cannot be calendering he cannot be calendering we cannot be calendering you cannot be calendering they cannot be calendering
Perfect
I cannot have calendered you cannot have calendered he cannot have calendered we cannot have calendered you cannot have calendered they cannot have calendered
V-ing perfect
I cannot have been calendering you cannot have been calendering he cannot have been calendering we cannot have been calendering you cannot have been calendering they cannot have been calendering
Interrogative form
Simple form
can I calender? can you calender? can he calender? can we calender? can you calender? can they calender?
V-ing form
can I be calendering? can you be calendering? can he be calendering? can we be calendering? can you be calendering? can they be calendering?
Perfect
can I have calendered? can you have calendered? can he have calendered? can we have calendered? can you have calendered? can they have calendered?
V-ing perfect
can I have been calendering? can you have been calendering? can he have been calendering? can we have been calendering? can you have been calendering? can they have been calendering?
Interro-negative form
Simple form
can I not calender? can you not calender? can he not calender? can we not calender? can you not calender? can they not calender?
V-ing form
can I not be calendering? can you not be calendering? can he not be calendering? can we not be calendering? can you not be calendering? can they not be calendering?
Perfect
can I not have calendered? can you not have calendered? can he not have calendered? can we not have calendered? can you not have calendered? can they not have calendered?
V-ing perfect
can I not have been calendering? can you not have been calendering? can he not have been calendering? can we not have been calendering? can you not have been calendering? can they not have been calendering?