could conserve
Regular verb: conserve - conserved- conserved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could conserve
you could conserve
he could conserve
we could conserve
you could conserve
they could conserve 	I could be conserving
you could be conserving
he could be conserving
we could be conserving
you could be conserving
they could be conserving	I could have conserved
you could have conserved
he could have conserved
we could have conserved
you could have conserved
they could have conserved	I could have been conserving
you could have been conserving
he could have been conserving
we could have been conserving
you could have been conserving
they could have been conserving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not conserve
you could not conserve
he could not conserve
we could not conserve
you could not conserve
they could not conserve 	I could not be conserving
you could not be conserving
he could not be conserving
we could not be conserving
you could not be conserving
they could not be conserving	I could not have conserved
you could not have conserved
he could not have conserved
we could not have conserved
you could not have conserved
they could not have conserved	I could not have been conserving
you could not have been conserving
he could not have been conserving
we could not have been conserving
you could not have been conserving
they could not have been conserving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I conserve?
could you conserve?
could he conserve?
could we conserve?
could you conserve?
could they conserve? 	could I be conserving?
could you be conserving?
could he be conserving?
could we be conserving?
could you be conserving?
could they be conserving? 	could I have conserved?
could you have conserved?
could he have conserved?
could we have conserved?
could you have conserved?
could they have conserved? 	could I have been conserving?
could you have been conserving?
could he have been conserving?
could we have been conserving?
could you have been conserving?
could they have been conserving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not conserve?
could you not conserve?
could he not conserve?
could we not conserve?
could you not conserve?
could they not conserve? 	could I not be conserving?
could you not be conserving?
could he not be conserving?
could we not be conserving?
could you not be conserving?
could they not be conserving? 	could I not have conserved?
could you not have conserved?
could he not have conserved?
could we not have conserved?
could you not have conserved?
could they not have conserved? 	could I not have been conserving?
could you not have been conserving?
could he not have been conserving?
could we not have been conserving?
could you not have been conserving?
could they not have been conserving?