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 can't calender you can't calender he can't calender we can't calender you can't calender they can't calender
V-ing form
I can't be calendering you can't be calendering he can't be calendering we can't be calendering you can't be calendering they can't be calendering
Perfect
I can't have calendered you can't have calendered he can't have calendered we can't have calendered you can't have calendered they can't have calendered
V-ing perfect
I can't have been calendering you can't have been calendering he can't have been calendering we can't have been calendering you can't have been calendering they can't 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't I calender? can't you calender? can't he calender? can't we calender? can't you calender? can't they calender?
V-ing form
can't I be calendering? can't you be calendering? can't he be calendering? can't we be calendering? can't you be calendering? can't they be calendering?
Perfect
can't I have calendered? can't you have calendered? can't he have calendered? can't we have calendered? can't you have calendered? can't they have calendered?
V-ing perfect
can't I have been calendering? can't you have been calendering? can't he have been calendering? can't we have been calendering? can't you have been calendering? can't they have been calendering?