must underpay
Verbo irregular: underpay - underpaid- underpaid

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must underpay
you must underpay
he must underpay
we must underpay
you must underpay
they must underpay 	I must be underpaying
you must be underpaying
he must be underpaying
we must be underpaying
you must be underpaying
they must be underpaying	I must have underpaid
you must have underpaid
he must have underpaid
we must have underpaid
you must have underpaid
they must have underpaid	I must have been underpaying
you must have been underpaying
he must have been underpaying
we must have been underpaying
you must have been underpaying
they must have been underpaying	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't underpay
you mustn't underpay
he mustn't underpay
we mustn't underpay
you mustn't underpay
they mustn't underpay 	I mustn't be underpaying
you mustn't be underpaying
he mustn't be underpaying
we mustn't be underpaying
you mustn't be underpaying
they mustn't be underpaying	I mustn't have underpaid
you mustn't have underpaid
he mustn't have underpaid
we mustn't have underpaid
you mustn't have underpaid
they mustn't have underpaid	I mustn't have been underpaying
you mustn't have been underpaying
he mustn't have been underpaying
we mustn't have been underpaying
you mustn't have been underpaying
they mustn't have been underpaying	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I underpay?
must you underpay?
must he underpay?
must we underpay?
must you underpay?
must they underpay? 	must I be underpaying?
must you be underpaying?
must he be underpaying?
must we be underpaying?
must you be underpaying?
must they be underpaying? 	must I have underpaid?
must you have underpaid?
must he have underpaid?
must we have underpaid?
must you have underpaid?
must they have underpaid? 	must I have been underpaying?
must you have been underpaying?
must he have been underpaying?
must we have been underpaying?
must you have been underpaying?
must they have been underpaying? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I underpay?
mustn't you underpay?
mustn't he underpay?
mustn't we underpay?
mustn't you underpay?
mustn't they underpay? 	mustn't I be underpaying?
mustn't you be underpaying?
mustn't he be underpaying?
mustn't we be underpaying?
mustn't you be underpaying?
mustn't they be underpaying? 	mustn't I have underpaid?
mustn't you have underpaid?
mustn't he have underpaid?
mustn't we have underpaid?
mustn't you have underpaid?
mustn't they have underpaid? 	mustn't I have been underpaying?
mustn't you have been underpaying?
mustn't he have been underpaying?
mustn't we have been underpaying?
mustn't you have been underpaying?
mustn't they have been underpaying?