must counterweight
Verbe régulier : counterweight - counterweighted- counterweighted

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must counterweight
you must counterweight
he must counterweight
we must counterweight
you must counterweight
they must counterweight 	I must be counterweighting
you must be counterweighting
he must be counterweighting
we must be counterweighting
you must be counterweighting
they must be counterweighting	I must have counterweighted
you must have counterweighted
he must have counterweighted
we must have counterweighted
you must have counterweighted
they must have counterweighted	I must have been counterweighting
you must have been counterweighting
he must have been counterweighting
we must have been counterweighting
you must have been counterweighting
they must have been counterweighting	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't counterweight
you mustn't counterweight
he mustn't counterweight
we mustn't counterweight
you mustn't counterweight
they mustn't counterweight 	I mustn't be counterweighting
you mustn't be counterweighting
he mustn't be counterweighting
we mustn't be counterweighting
you mustn't be counterweighting
they mustn't be counterweighting	I mustn't have counterweighted
you mustn't have counterweighted
he mustn't have counterweighted
we mustn't have counterweighted
you mustn't have counterweighted
they mustn't have counterweighted	I mustn't have been counterweighting
you mustn't have been counterweighting
he mustn't have been counterweighting
we mustn't have been counterweighting
you mustn't have been counterweighting
they mustn't have been counterweighting	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I counterweight?
must you counterweight?
must he counterweight?
must we counterweight?
must you counterweight?
must they counterweight? 	must I be counterweighting?
must you be counterweighting?
must he be counterweighting?
must we be counterweighting?
must you be counterweighting?
must they be counterweighting? 	must I have counterweighted?
must you have counterweighted?
must he have counterweighted?
must we have counterweighted?
must you have counterweighted?
must they have counterweighted? 	must I have been counterweighting?
must you have been counterweighting?
must he have been counterweighting?
must we have been counterweighting?
must you have been counterweighting?
must they have been counterweighting? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I counterweight?
mustn't you counterweight?
mustn't he counterweight?
mustn't we counterweight?
mustn't you counterweight?
mustn't they counterweight? 	mustn't I be counterweighting?
mustn't you be counterweighting?
mustn't he be counterweighting?
mustn't we be counterweighting?
mustn't you be counterweighting?
mustn't they be counterweighting? 	mustn't I have counterweighted?
mustn't you have counterweighted?
mustn't he have counterweighted?
mustn't we have counterweighted?
mustn't you have counterweighted?
mustn't they have counterweighted? 	mustn't I have been counterweighting?
mustn't you have been counterweighting?
mustn't he have been counterweighting?
mustn't we have been counterweighting?
mustn't you have been counterweighting?
mustn't they have been counterweighting?