I can haven you can haven he can haven we can haven you can haven they can haven
V-ing form
I can be havening you can be havening he can be havening we can be havening you can be havening they can be havening
Perfect
I can have havened you can have havened he can have havened we can have havened you can have havened they can have havened
V-ing perfect
I can have been havening you can have been havening he can have been havening we can have been havening you can have been havening they can have been havening
Negation
Simple form
I can't haven you can't haven he can't haven we can't haven you can't haven they can't haven
V-ing form
I can't be havening you can't be havening he can't be havening we can't be havening you can't be havening they can't be havening
Perfect
I can't have havened you can't have havened he can't have havened we can't have havened you can't have havened they can't have havened
V-ing perfect
I can't have been havening you can't have been havening he can't have been havening we can't have been havening you can't have been havening they can't have been havening
Interrogative form
Simple form
can I haven? can you haven? can he haven? can we haven? can you haven? can they haven?
V-ing form
can I be havening? can you be havening? can he be havening? can we be havening? can you be havening? can they be havening?
Perfect
can I have havened? can you have havened? can he have havened? can we have havened? can you have havened? can they have havened?
V-ing perfect
can I have been havening? can you have been havening? can he have been havening? can we have been havening? can you have been havening? can they have been havening?
Interro-negative form
Simple form
can't I haven? can't you haven? can't he haven? can't we haven? can't you haven? can't they haven?
V-ing form
can't I be havening? can't you be havening? can't he be havening? can't we be havening? can't you be havening? can't they be havening?
Perfect
can't I have havened? can't you have havened? can't he have havened? can't we have havened? can't you have havened? can't they have havened?
V-ing perfect
can't I have been havening? can't you have been havening? can't he have been havening? can't we have been havening? can't you have been havening? can't they have been havening?