must refute
Verbo regular: refute - refuted- refuted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must refute
you must refute
he must refute
we must refute
you must refute
they must refute 	I must be refuting
you must be refuting
he must be refuting
we must be refuting
you must be refuting
they must be refuting	I must have refuted
you must have refuted
he must have refuted
we must have refuted
you must have refuted
they must have refuted	I must have been refuting
you must have been refuting
he must have been refuting
we must have been refuting
you must have been refuting
they must have been refuting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't refute
you mustn't refute
he mustn't refute
we mustn't refute
you mustn't refute
they mustn't refute 	I mustn't be refuting
you mustn't be refuting
he mustn't be refuting
we mustn't be refuting
you mustn't be refuting
they mustn't be refuting	I mustn't have refuted
you mustn't have refuted
he mustn't have refuted
we mustn't have refuted
you mustn't have refuted
they mustn't have refuted	I mustn't have been refuting
you mustn't have been refuting
he mustn't have been refuting
we mustn't have been refuting
you mustn't have been refuting
they mustn't have been refuting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I refute?
must you refute?
must he refute?
must we refute?
must you refute?
must they refute? 	must I be refuting?
must you be refuting?
must he be refuting?
must we be refuting?
must you be refuting?
must they be refuting? 	must I have refuted?
must you have refuted?
must he have refuted?
must we have refuted?
must you have refuted?
must they have refuted? 	must I have been refuting?
must you have been refuting?
must he have been refuting?
must we have been refuting?
must you have been refuting?
must they have been refuting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I refute?
mustn't you refute?
mustn't he refute?
mustn't we refute?
mustn't you refute?
mustn't they refute? 	mustn't I be refuting?
mustn't you be refuting?
mustn't he be refuting?
mustn't we be refuting?
mustn't you be refuting?
mustn't they be refuting? 	mustn't I have refuted?
mustn't you have refuted?
mustn't he have refuted?
mustn't we have refuted?
mustn't you have refuted?
mustn't they have refuted? 	mustn't I have been refuting?
mustn't you have been refuting?
mustn't he have been refuting?
mustn't we have been refuting?
mustn't you have been refuting?
mustn't they have been refuting?