I can worsen you can worsen he can worsen we can worsen you can worsen they can worsen
V-ing form
I can be worsening you can be worsening he can be worsening we can be worsening you can be worsening they can be worsening
Perfect
I can have worsened you can have worsened he can have worsened we can have worsened you can have worsened they can have worsened
V-ing perfect
I can have been worsening you can have been worsening he can have been worsening we can have been worsening you can have been worsening they can have been worsening
Negation
Simple form
I can't worsen you can't worsen he can't worsen we can't worsen you can't worsen they can't worsen
V-ing form
I can't be worsening you can't be worsening he can't be worsening we can't be worsening you can't be worsening they can't be worsening
Perfect
I can't have worsened you can't have worsened he can't have worsened we can't have worsened you can't have worsened they can't have worsened
V-ing perfect
I can't have been worsening you can't have been worsening he can't have been worsening we can't have been worsening you can't have been worsening they can't have been worsening
Interrogative form
Simple form
can I worsen? can you worsen? can he worsen? can we worsen? can you worsen? can they worsen?
V-ing form
can I be worsening? can you be worsening? can he be worsening? can we be worsening? can you be worsening? can they be worsening?
Perfect
can I have worsened? can you have worsened? can he have worsened? can we have worsened? can you have worsened? can they have worsened?
V-ing perfect
can I have been worsening? can you have been worsening? can he have been worsening? can we have been worsening? can you have been worsening? can they have been worsening?
Interro-negative form
Simple form
can't I worsen? can't you worsen? can't he worsen? can't we worsen? can't you worsen? can't they worsen?
V-ing form
can't I be worsening? can't you be worsening? can't he be worsening? can't we be worsening? can't you be worsening? can't they be worsening?
Perfect
can't I have worsened? can't you have worsened? can't he have worsened? can't we have worsened? can't you have worsened? can't they have worsened?
V-ing perfect
can't I have been worsening? can't you have been worsening? can't he have been worsening? can't we have been worsening? can't you have been worsening? can't they have been worsening?