must undercount
Verbe régulier : undercount - undercounted- undercounted

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must undercount
you must undercount
he must undercount
we must undercount
you must undercount
they must undercount 	I must be undercounting
you must be undercounting
he must be undercounting
we must be undercounting
you must be undercounting
they must be undercounting	I must have undercounted
you must have undercounted
he must have undercounted
we must have undercounted
you must have undercounted
they must have undercounted	I must have been undercounting
you must have been undercounting
he must have been undercounting
we must have been undercounting
you must have been undercounting
they must have been undercounting	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't undercount
you mustn't undercount
he mustn't undercount
we mustn't undercount
you mustn't undercount
they mustn't undercount 	I mustn't be undercounting
you mustn't be undercounting
he mustn't be undercounting
we mustn't be undercounting
you mustn't be undercounting
they mustn't be undercounting	I mustn't have undercounted
you mustn't have undercounted
he mustn't have undercounted
we mustn't have undercounted
you mustn't have undercounted
they mustn't have undercounted	I mustn't have been undercounting
you mustn't have been undercounting
he mustn't have been undercounting
we mustn't have been undercounting
you mustn't have been undercounting
they mustn't have been undercounting	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I undercount?
must you undercount?
must he undercount?
must we undercount?
must you undercount?
must they undercount? 	must I be undercounting?
must you be undercounting?
must he be undercounting?
must we be undercounting?
must you be undercounting?
must they be undercounting? 	must I have undercounted?
must you have undercounted?
must he have undercounted?
must we have undercounted?
must you have undercounted?
must they have undercounted? 	must I have been undercounting?
must you have been undercounting?
must he have been undercounting?
must we have been undercounting?
must you have been undercounting?
must they have been undercounting? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I undercount?
mustn't you undercount?
mustn't he undercount?
mustn't we undercount?
mustn't you undercount?
mustn't they undercount? 	mustn't I be undercounting?
mustn't you be undercounting?
mustn't he be undercounting?
mustn't we be undercounting?
mustn't you be undercounting?
mustn't they be undercounting? 	mustn't I have undercounted?
mustn't you have undercounted?
mustn't he have undercounted?
mustn't we have undercounted?
mustn't you have undercounted?
mustn't they have undercounted? 	mustn't I have been undercounting?
mustn't you have been undercounting?
mustn't he have been undercounting?
mustn't we have been undercounting?
mustn't you have been undercounting?
mustn't they have been undercounting?