could conserve
Regular verb: conserve - conserved- conserved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could conserve
you could conserve
she could conserve
we could conserve
you could conserve
they could conserve 	I could be conserving
you could be conserving
she could be conserving
we could be conserving
you could be conserving
they could be conserving	I could have conserved
you could have conserved
she 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
she 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 couldn't conserve
you couldn't conserve
she couldn't conserve
we couldn't conserve
you couldn't conserve
they couldn't conserve 	I couldn't be conserving
you couldn't be conserving
she couldn't be conserving
we couldn't be conserving
you couldn't be conserving
they couldn't be conserving	I couldn't have conserved
you couldn't have conserved
she couldn't have conserved
we couldn't have conserved
you couldn't have conserved
they couldn't have conserved	I couldn't have been conserving
you couldn't have been conserving
she couldn't have been conserving
we couldn't have been conserving
you couldn't have been conserving
they couldn't have been conserving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I conserve?
could you conserve?
could she conserve?
could we conserve?
could you conserve?
could they conserve? 	could I be conserving?
could you be conserving?
could she be conserving?
could we be conserving?
could you be conserving?
could they be conserving? 	could I have conserved?
could you have conserved?
could she 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 she 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 	
couldn't I conserve?
couldn't you conserve?
couldn't she conserve?
couldn't we conserve?
couldn't you conserve?
couldn't they conserve? 	couldn't I be conserving?
couldn't you be conserving?
couldn't she be conserving?
couldn't we be conserving?
couldn't you be conserving?
couldn't they be conserving? 	couldn't I have conserved?
couldn't you have conserved?
couldn't she have conserved?
couldn't we have conserved?
couldn't you have conserved?
couldn't they have conserved? 	couldn't I have been conserving?
couldn't you have been conserving?
couldn't she have been conserving?
couldn't we have been conserving?
couldn't you have been conserving?
couldn't they have been conserving?