must conserve
Verbe régulier : conserve - conserved- conserved
Traduction française : économiser - protéger 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must conserve
you must conserve
she must conserve
we must conserve
you must conserve
they must conserve 	I must be conserving
you must be conserving
she must be conserving
we must be conserving
you must be conserving
they must be conserving	I must have conserved
you must have conserved
she must have conserved
we must have conserved
you must have conserved
they must have conserved	I must have been conserving
you must have been conserving
she must have been conserving
we must have been conserving
you must have been conserving
they must have been conserving	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't conserve
you mustn't conserve
she mustn't conserve
we mustn't conserve
you mustn't conserve
they mustn't conserve 	I mustn't be conserving
you mustn't be conserving
she mustn't be conserving
we mustn't be conserving
you mustn't be conserving
they mustn't be conserving	I mustn't have conserved
you mustn't have conserved
she mustn't have conserved
we mustn't have conserved
you mustn't have conserved
they mustn't have conserved	I mustn't have been conserving
you mustn't have been conserving
she mustn't have been conserving
we mustn't have been conserving
you mustn't have been conserving
they mustn't have been conserving	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I conserve?
must you conserve?
must she conserve?
must we conserve?
must you conserve?
must they conserve? 	must I be conserving?
must you be conserving?
must she be conserving?
must we be conserving?
must you be conserving?
must they be conserving? 	must I have conserved?
must you have conserved?
must she have conserved?
must we have conserved?
must you have conserved?
must they have conserved? 	must I have been conserving?
must you have been conserving?
must she have been conserving?
must we have been conserving?
must you have been conserving?
must they have been conserving? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I conserve?
mustn't you conserve?
mustn't she conserve?
mustn't we conserve?
mustn't you conserve?
mustn't they conserve? 	mustn't I be conserving?
mustn't you be conserving?
mustn't she be conserving?
mustn't we be conserving?
mustn't you be conserving?
mustn't they be conserving? 	mustn't I have conserved?
mustn't you have conserved?
mustn't she have conserved?
mustn't we have conserved?
mustn't you have conserved?
mustn't they have conserved? 	mustn't I have been conserving?
mustn't you have been conserving?
mustn't she have been conserving?
mustn't we have been conserving?
mustn't you have been conserving?
mustn't they have been conserving?