must undersell
Verbe irrégulier : undersell - undersold- undersold
Traduction française : vendre moins cher que - se vendre mal 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must undersell
you must undersell
she must undersell
we must undersell
you must undersell
they must undersell 	I must be underselling
you must be underselling
she must be underselling
we must be underselling
you must be underselling
they must be underselling	I must have undersold
you must have undersold
she must have undersold
we must have undersold
you must have undersold
they must have undersold	I must have been underselling
you must have been underselling
she must have been underselling
we must have been underselling
you must have been underselling
they must have been underselling	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't undersell
you mustn't undersell
she mustn't undersell
we mustn't undersell
you mustn't undersell
they mustn't undersell 	I mustn't be underselling
you mustn't be underselling
she mustn't be underselling
we mustn't be underselling
you mustn't be underselling
they mustn't be underselling	I mustn't have undersold
you mustn't have undersold
she mustn't have undersold
we mustn't have undersold
you mustn't have undersold
they mustn't have undersold	I mustn't have been underselling
you mustn't have been underselling
she mustn't have been underselling
we mustn't have been underselling
you mustn't have been underselling
they mustn't have been underselling	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I undersell?
must you undersell?
must she undersell?
must we undersell?
must you undersell?
must they undersell? 	must I be underselling?
must you be underselling?
must she be underselling?
must we be underselling?
must you be underselling?
must they be underselling? 	must I have undersold?
must you have undersold?
must she have undersold?
must we have undersold?
must you have undersold?
must they have undersold? 	must I have been underselling?
must you have been underselling?
must she have been underselling?
must we have been underselling?
must you have been underselling?
must they have been underselling? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I undersell?
mustn't you undersell?
mustn't she undersell?
mustn't we undersell?
mustn't you undersell?
mustn't they undersell? 	mustn't I be underselling?
mustn't you be underselling?
mustn't she be underselling?
mustn't we be underselling?
mustn't you be underselling?
mustn't they be underselling? 	mustn't I have undersold?
mustn't you have undersold?
mustn't she have undersold?
mustn't we have undersold?
mustn't you have undersold?
mustn't they have undersold? 	mustn't I have been underselling?
mustn't you have been underselling?
mustn't she have been underselling?
mustn't we have been underselling?
mustn't you have been underselling?
mustn't they have been underselling?