I can burden you can burden he can burden we can burden you can burden they can burden
V-ing form
I can be burdening you can be burdening he can be burdening we can be burdening you can be burdening they can be burdening
Perfect
I can have burdened you can have burdened he can have burdened we can have burdened you can have burdened they can have burdened
V-ing perfect
I can have been burdening you can have been burdening he can have been burdening we can have been burdening you can have been burdening they can have been burdening
Negation
Simple form
I cannot burden you cannot burden he cannot burden we cannot burden you cannot burden they cannot burden
V-ing form
I cannot be burdening you cannot be burdening he cannot be burdening we cannot be burdening you cannot be burdening they cannot be burdening
Perfect
I cannot have burdened you cannot have burdened he cannot have burdened we cannot have burdened you cannot have burdened they cannot have burdened
V-ing perfect
I cannot have been burdening you cannot have been burdening he cannot have been burdening we cannot have been burdening you cannot have been burdening they cannot have been burdening
Interrogative form
Simple form
can I burden? can you burden? can he burden? can we burden? can you burden? can they burden?
V-ing form
can I be burdening? can you be burdening? can he be burdening? can we be burdening? can you be burdening? can they be burdening?
Perfect
can I have burdened? can you have burdened? can he have burdened? can we have burdened? can you have burdened? can they have burdened?
V-ing perfect
can I have been burdening? can you have been burdening? can he have been burdening? can we have been burdening? can you have been burdening? can they have been burdening?
Interro-negative form
Simple form
can I not burden? can you not burden? can he not burden? can we not burden? can you not burden? can they not burden?
V-ing form
can I not be burdening? can you not be burdening? can he not be burdening? can we not be burdening? can you not be burdening? can they not be burdening?
Perfect
can I not have burdened? can you not have burdened? can he not have burdened? can we not have burdened? can you not have burdened? can they not have burdened?
V-ing perfect
can I not have been burdening? can you not have been burdening? can he not have been burdening? can we not have been burdening? can you not have been burdening? can they not have been burdening?