could worsen
Verbo regular: worsen - worsened- worsened

Afirmación 	
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I could worsen
you could worsen
she could worsen
we could worsen
you could worsen
they could worsen 	I could be worsening
you could be worsening
she could be worsening
we could be worsening
you could be worsening
they could be worsening	I could have worsened
you could have worsened
she 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
she could have been worsening
we could have been worsening
you could have been worsening
they could have been worsening	

Negación 	
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I couldn't worsen
you couldn't worsen
she couldn't worsen
we couldn't worsen
you couldn't worsen
they couldn't worsen 	I couldn't be worsening
you couldn't be worsening
she couldn't be worsening
we couldn't be worsening
you couldn't be worsening
they couldn't be worsening	I couldn't have worsened
you couldn't have worsened
she couldn't have worsened
we couldn't have worsened
you couldn't have worsened
they couldn't have worsened	I couldn't have been worsening
you couldn't have been worsening
she couldn't have been worsening
we couldn't have been worsening
you couldn't have been worsening
they couldn't have been worsening	

Forma interrogativa 	
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could I worsen?
could you worsen?
could she worsen?
could we worsen?
could you worsen?
could they worsen? 	could I be worsening?
could you be worsening?
could she be worsening?
could we be worsening?
could you be worsening?
could they be worsening? 	could I have worsened?
could you have worsened?
could she 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 she have been worsening?
could we have been worsening?
could you have been worsening?
could they have been worsening? 	

Forma interro-negativa 	
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couldn't I worsen?
couldn't you worsen?
couldn't she worsen?
couldn't we worsen?
couldn't you worsen?
couldn't they worsen? 	couldn't I be worsening?
couldn't you be worsening?
couldn't she be worsening?
couldn't we be worsening?
couldn't you be worsening?
couldn't they be worsening? 	couldn't I have worsened?
couldn't you have worsened?
couldn't she have worsened?
couldn't we have worsened?
couldn't you have worsened?
couldn't they have worsened? 	couldn't I have been worsening?
couldn't you have been worsening?
couldn't she have been worsening?
couldn't we have been worsening?
couldn't you have been worsening?
couldn't they have been worsening?