must cost
Verbe irrégulier : cost - cost- cost
Traduction française : coûter 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must cost
you must cost
he must cost
we must cost
you must cost
they must cost 	I must be costing
you must be costing
he must be costing
we must be costing
you must be costing
they must be costing	I must have cost
you must have cost
he must have cost
we must have cost
you must have cost
they must have cost	I must have been costing
you must have been costing
he must have been costing
we must have been costing
you must have been costing
they must have been costing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't cost
you mustn't cost
he mustn't cost
we mustn't cost
you mustn't cost
they mustn't cost 	I mustn't be costing
you mustn't be costing
he mustn't be costing
we mustn't be costing
you mustn't be costing
they mustn't be costing	I mustn't have cost
you mustn't have cost
he mustn't have cost
we mustn't have cost
you mustn't have cost
they mustn't have cost	I mustn't have been costing
you mustn't have been costing
he mustn't have been costing
we mustn't have been costing
you mustn't have been costing
they mustn't have been costing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I cost?
must you cost?
must he cost?
must we cost?
must you cost?
must they cost? 	must I be costing?
must you be costing?
must he be costing?
must we be costing?
must you be costing?
must they be costing? 	must I have cost?
must you have cost?
must he have cost?
must we have cost?
must you have cost?
must they have cost? 	must I have been costing?
must you have been costing?
must he have been costing?
must we have been costing?
must you have been costing?
must they have been costing? 	

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