could worsen
Regular verb: worsen - worsened- worsened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could worsen
you could worsen
he could worsen
we could worsen
you could worsen
they could worsen 	I could be worsening
you could be worsening
he could be worsening
we could be worsening
you could be worsening
they could be worsening	I could have worsened
you could have worsened
he could have worsened
we could have worsened
you could have worsened
they could have worsened	I could have been worsening
you could have been worsening
he could have been worsening
we could have been worsening
you could have been worsening
they could have been worsening	

Negation 	
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I could not worsen
you could not worsen
he could not worsen
we could not worsen
you could not worsen
they could not worsen 	I could not be worsening
you could not be worsening
he could not be worsening
we could not be worsening
you could not be worsening
they could not be worsening	I could not have worsened
you could not have worsened
he could not have worsened
we could not have worsened
you could not have worsened
they could not have worsened	I could not have been worsening
you could not have been worsening
he could not have been worsening
we could not have been worsening
you could not have been worsening
they could not have been worsening	

Interrogative form 	
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could I worsen?
could you worsen?
could he worsen?
could we worsen?
could you worsen?
could they worsen? 	could I be worsening?
could you be worsening?
could he be worsening?
could we be worsening?
could you be worsening?
could they be worsening? 	could I have worsened?
could you have worsened?
could he have worsened?
could we have worsened?
could you have worsened?
could they have worsened? 	could I have been worsening?
could you have been worsening?
could he have been worsening?
could we have been worsening?
could you have been worsening?
could they have been worsening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not worsen?
could you not worsen?
could he not worsen?
could we not worsen?
could you not worsen?
could they not worsen? 	could I not be worsening?
could you not be worsening?
could he not be worsening?
could we not be worsening?
could you not be worsening?
could they not be worsening? 	could I not have worsened?
could you not have worsened?
could he not have worsened?
could we not have worsened?
could you not have worsened?
could they not have worsened? 	could I not have been worsening?
could you not have been worsening?
could he not have been worsening?
could we not have been worsening?
could you not have been worsening?
could they not have been worsening?