must refund
Verbo regular: refund - refunded- refunded

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must refund
you must refund
he must refund
we must refund
you must refund
they must refund 	I must be refunding
you must be refunding
he must be refunding
we must be refunding
you must be refunding
they must be refunding	I must have refunded
you must have refunded
he must have refunded
we must have refunded
you must have refunded
they must have refunded	I must have been refunding
you must have been refunding
he must have been refunding
we must have been refunding
you must have been refunding
they must have been refunding	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't refund
you mustn't refund
he mustn't refund
we mustn't refund
you mustn't refund
they mustn't refund 	I mustn't be refunding
you mustn't be refunding
he mustn't be refunding
we mustn't be refunding
you mustn't be refunding
they mustn't be refunding	I mustn't have refunded
you mustn't have refunded
he mustn't have refunded
we mustn't have refunded
you mustn't have refunded
they mustn't have refunded	I mustn't have been refunding
you mustn't have been refunding
he mustn't have been refunding
we mustn't have been refunding
you mustn't have been refunding
they mustn't have been refunding	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I refund?
must you refund?
must he refund?
must we refund?
must you refund?
must they refund? 	must I be refunding?
must you be refunding?
must he be refunding?
must we be refunding?
must you be refunding?
must they be refunding? 	must I have refunded?
must you have refunded?
must he have refunded?
must we have refunded?
must you have refunded?
must they have refunded? 	must I have been refunding?
must you have been refunding?
must he have been refunding?
must we have been refunding?
must you have been refunding?
must they have been refunding? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I refund?
mustn't you refund?
mustn't he refund?
mustn't we refund?
mustn't you refund?
mustn't they refund? 	mustn't I be refunding?
mustn't you be refunding?
mustn't he be refunding?
mustn't we be refunding?
mustn't you be refunding?
mustn't they be refunding? 	mustn't I have refunded?
mustn't you have refunded?
mustn't he have refunded?
mustn't we have refunded?
mustn't you have refunded?
mustn't they have refunded? 	mustn't I have been refunding?
mustn't you have been refunding?
mustn't he have been refunding?
mustn't we have been refunding?
mustn't you have been refunding?
mustn't they have been refunding?