I can worsen you can worsen she can worsen we can worsen you can worsen they can worsen
V-ing form
I can be worsening you can be worsening she can be worsening we can be worsening you can be worsening they can be worsening
Perfect
I can have worsened you can have worsened she 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 she can have been worsening we can have been worsening you can have been worsening they can have been worsening
Negation
Simple form
I cannot worsen you cannot worsen she cannot worsen we cannot worsen you cannot worsen they cannot worsen
V-ing form
I cannot be worsening you cannot be worsening she cannot be worsening we cannot be worsening you cannot be worsening they cannot be worsening
Perfect
I cannot have worsened you cannot have worsened she cannot have worsened we cannot have worsened you cannot have worsened they cannot have worsened
V-ing perfect
I cannot have been worsening you cannot have been worsening she cannot have been worsening we cannot have been worsening you cannot have been worsening they cannot have been worsening
Interrogative form
Simple form
can I worsen? can you worsen? can she worsen? can we worsen? can you worsen? can they worsen?
V-ing form
can I be worsening? can you be worsening? can she be worsening? can we be worsening? can you be worsening? can they be worsening?
Perfect
can I have worsened? can you have worsened? can she 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 she have been worsening? can we have been worsening? can you have been worsening? can they have been worsening?
Interro-negative form
Simple form
can I not worsen? can you not worsen? can she not worsen? can we not worsen? can you not worsen? can they not worsen?
V-ing form
can I not be worsening? can you not be worsening? can she not be worsening? can we not be worsening? can you not be worsening? can they not be worsening?
Perfect
can I not have worsened? can you not have worsened? can she not have worsened? can we not have worsened? can you not have worsened? can they not have worsened?
V-ing perfect
can I not have been worsening? can you not have been worsening? can she not have been worsening? can we not have been worsening? can you not have been worsening? can they not have been worsening?