must worsen
Verbo regular: worsen - worsened- worsened

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must worsen
you must worsen
she must worsen
we must worsen
you must worsen
they must worsen 	I must be worsening
you must be worsening
she must be worsening
we must be worsening
you must be worsening
they must be worsening	I must have worsened
you must have worsened
she must have worsened
we must have worsened
you must have worsened
they must have worsened	I must have been worsening
you must have been worsening
she must have been worsening
we must have been worsening
you must have been worsening
they must have been worsening	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not worsen
you must not worsen
she must not worsen
we must not worsen
you must not worsen
they must not worsen 	I must not be worsening
you must not be worsening
she must not be worsening
we must not be worsening
you must not be worsening
they must not be worsening	I must not have worsened
you must not have worsened
she must not have worsened
we must not have worsened
you must not have worsened
they must not have worsened	I must not have been worsening
you must not have been worsening
she must not have been worsening
we must not have been worsening
you must not have been worsening
they must not have been worsening	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I worsen?
must you worsen?
must she worsen?
must we worsen?
must you worsen?
must they worsen? 	must I be worsening?
must you be worsening?
must she be worsening?
must we be worsening?
must you be worsening?
must they be worsening? 	must I have worsened?
must you have worsened?
must she have worsened?
must we have worsened?
must you have worsened?
must they have worsened? 	must I have been worsening?
must you have been worsening?
must she have been worsening?
must we have been worsening?
must you have been worsening?
must they have been worsening? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not worsen?
must you not worsen?
must she not worsen?
must we not worsen?
must you not worsen?
must they not worsen? 	must I not be worsening?
must you not be worsening?
must she not be worsening?
must we not be worsening?
must you not be worsening?
must they not be worsening? 	must I not have worsened?
must you not have worsened?
must she not have worsened?
must we not have worsened?
must you not have worsened?
must they not have worsened? 	must I not have been worsening?
must you not have been worsening?
must she not have been worsening?
must we not have been worsening?
must you not have been worsening?
must they not have been worsening?