must refund
Verbo regular: refund - refunded- refunded

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not refund
you must not refund
he must not refund
we must not refund
you must not refund
they must not refund 	I must not be refunding
you must not be refunding
he must not be refunding
we must not be refunding
you must not be refunding
they must not be refunding	I must not have refunded
you must not have refunded
he must not have refunded
we must not have refunded
you must not have refunded
they must not have refunded	I must not have been refunding
you must not have been refunding
he must not have been refunding
we must not have been refunding
you must not have been refunding
they must not have been refunding	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not refund?
must you not refund?
must he not refund?
must we not refund?
must you not refund?
must they not refund? 	must I not be refunding?
must you not be refunding?
must he not be refunding?
must we not be refunding?
must you not be refunding?
must they not be refunding? 	must I not have refunded?
must you not have refunded?
must he not have refunded?
must we not have refunded?
must you not have refunded?
must they not have refunded? 	must I not have been refunding?
must you not have been refunding?
must he not have been refunding?
must we not have been refunding?
must you not have been refunding?
must they not have been refunding?