can worsen
Regular verb: worsen - worsened- worsened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can worsen
you can worsen
she can worsen
we can worsen
you can worsen
they can worsen 	I can be worsening
you can be worsening
she can be worsening
we can be worsening
you can be worsening
they can be worsening	I can have worsened
you can have worsened
she can have worsened
we can have worsened
you can have worsened
they can have worsened	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 	V-ing form 	Perfect 	V-ing perfect 	
I cannot worsen
you cannot worsen
she cannot worsen
we cannot worsen
you cannot worsen
they cannot worsen 	I cannot be worsening
you cannot be worsening
she cannot be worsening
we cannot be worsening
you cannot be worsening
they cannot be worsening	I cannot have worsened
you cannot have worsened
she cannot have worsened
we cannot have worsened
you cannot have worsened
they cannot have worsened	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 	V-ing form 	Perfect 	V-ing perfect 	
can I worsen?
can you worsen?
can she worsen?
can we worsen?
can you worsen?
can they worsen? 	can I be worsening?
can you be worsening?
can she be worsening?
can we be worsening?
can you be worsening?
can they be worsening? 	can I have worsened?
can you have worsened?
can she have worsened?
can we have worsened?
can you have worsened?
can they have worsened? 	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 	V-ing form 	Perfect 	V-ing perfect 	
can I not worsen?
can you not worsen?
can she not worsen?
can we not worsen?
can you not worsen?
can they not worsen? 	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? 	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? 	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?