must unscrew
Verbo regular: unscrew - unscrewed- unscrewed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must unscrew
you must unscrew
he must unscrew
we must unscrew
you must unscrew
they must unscrew 	I must be unscrewing
you must be unscrewing
he must be unscrewing
we must be unscrewing
you must be unscrewing
they must be unscrewing	I must have unscrewed
you must have unscrewed
he must have unscrewed
we must have unscrewed
you must have unscrewed
they must have unscrewed	I must have been unscrewing
you must have been unscrewing
he must have been unscrewing
we must have been unscrewing
you must have been unscrewing
they must have been unscrewing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not unscrew
you must not unscrew
he must not unscrew
we must not unscrew
you must not unscrew
they must not unscrew 	I must not be unscrewing
you must not be unscrewing
he must not be unscrewing
we must not be unscrewing
you must not be unscrewing
they must not be unscrewing	I must not have unscrewed
you must not have unscrewed
he must not have unscrewed
we must not have unscrewed
you must not have unscrewed
they must not have unscrewed	I must not have been unscrewing
you must not have been unscrewing
he must not have been unscrewing
we must not have been unscrewing
you must not have been unscrewing
they must not have been unscrewing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I unscrew?
must you unscrew?
must he unscrew?
must we unscrew?
must you unscrew?
must they unscrew? 	must I be unscrewing?
must you be unscrewing?
must he be unscrewing?
must we be unscrewing?
must you be unscrewing?
must they be unscrewing? 	must I have unscrewed?
must you have unscrewed?
must he have unscrewed?
must we have unscrewed?
must you have unscrewed?
must they have unscrewed? 	must I have been unscrewing?
must you have been unscrewing?
must he have been unscrewing?
must we have been unscrewing?
must you have been unscrewing?
must they have been unscrewing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not unscrew?
must you not unscrew?
must he not unscrew?
must we not unscrew?
must you not unscrew?
must they not unscrew? 	must I not be unscrewing?
must you not be unscrewing?
must he not be unscrewing?
must we not be unscrewing?
must you not be unscrewing?
must they not be unscrewing? 	must I not have unscrewed?
must you not have unscrewed?
must he not have unscrewed?
must we not have unscrewed?
must you not have unscrewed?
must they not have unscrewed? 	must I not have been unscrewing?
must you not have been unscrewing?
must he not have been unscrewing?
must we not have been unscrewing?
must you not have been unscrewing?
must they not have been unscrewing?