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 can't burden you can't burden he can't burden we can't burden you can't burden they can't burden
V-ing form
I can't be burdening you can't be burdening he can't be burdening we can't be burdening you can't be burdening they can't be burdening
Perfect
I can't have burdened you can't have burdened he can't have burdened we can't have burdened you can't have burdened they can't have burdened
V-ing perfect
I can't have been burdening you can't have been burdening he can't have been burdening we can't have been burdening you can't have been burdening they can't 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't I burden? can't you burden? can't he burden? can't we burden? can't you burden? can't they burden?
V-ing form
can't I be burdening? can't you be burdening? can't he be burdening? can't we be burdening? can't you be burdening? can't they be burdening?
Perfect
can't I have burdened? can't you have burdened? can't he have burdened? can't we have burdened? can't you have burdened? can't they have burdened?
V-ing perfect
can't I have been burdening? can't you have been burdening? can't he have been burdening? can't we have been burdening? can't you have been burdening? can't they have been burdening?