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
he must conserve
we must conserve
you must conserve
they must conserve 	I must be conserving
you must be conserving
he must be conserving
we must be conserving
you must be conserving
they must be conserving	I must have conserved
you must have conserved
he 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
he 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 must not conserve
you must not conserve
he must not conserve
we must not conserve
you must not conserve
they must not conserve 	I must not be conserving
you must not be conserving
he must not be conserving
we must not be conserving
you must not be conserving
they must not be conserving	I must not have conserved
you must not have conserved
he must not have conserved
we must not have conserved
you must not have conserved
they must not have conserved	I must not have been conserving
you must not have been conserving
he must not have been conserving
we must not have been conserving
you must not have been conserving
they must not have been conserving	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I conserve?
must you conserve?
must he conserve?
must we conserve?
must you conserve?
must they conserve? 	must I be conserving?
must you be conserving?
must he be conserving?
must we be conserving?
must you be conserving?
must they be conserving? 	must I have conserved?
must you have conserved?
must he 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 he 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 	
must I not conserve?
must you not conserve?
must he not conserve?
must we not conserve?
must you not conserve?
must they not conserve? 	must I not be conserving?
must you not be conserving?
must he not be conserving?
must we not be conserving?
must you not be conserving?
must they not be conserving? 	must I not have conserved?
must you not have conserved?
must he not have conserved?
must we not have conserved?
must you not have conserved?
must they not have conserved? 	must I not have been conserving?
must you not have been conserving?
must he not have been conserving?
must we not have been conserving?
must you not have been conserving?
must they not have been conserving?