I can conserve you can conserve she can conserve we can conserve you can conserve they can conserve
V-ing form
I can be conserving you can be conserving she can be conserving we can be conserving you can be conserving they can be conserving
Perfect
I can have conserved you can have conserved she can have conserved we can have conserved you can have conserved they can have conserved
V-ing perfect
I can have been conserving you can have been conserving she can have been conserving we can have been conserving you can have been conserving they can have been conserving
Negation
Simple form
I can't conserve you can't conserve she can't conserve we can't conserve you can't conserve they can't conserve
V-ing form
I can't be conserving you can't be conserving she can't be conserving we can't be conserving you can't be conserving they can't be conserving
Perfect
I can't have conserved you can't have conserved she can't have conserved we can't have conserved you can't have conserved they can't have conserved
V-ing perfect
I can't have been conserving you can't have been conserving she can't have been conserving we can't have been conserving you can't have been conserving they can't have been conserving
Interrogative form
Simple form
can I conserve? can you conserve? can she conserve? can we conserve? can you conserve? can they conserve?
V-ing form
can I be conserving? can you be conserving? can she be conserving? can we be conserving? can you be conserving? can they be conserving?
Perfect
can I have conserved? can you have conserved? can she have conserved? can we have conserved? can you have conserved? can they have conserved?
V-ing perfect
can I have been conserving? can you have been conserving? can she have been conserving? can we have been conserving? can you have been conserving? can they have been conserving?
Interro-negative form
Simple form
can't I conserve? can't you conserve? can't she conserve? can't we conserve? can't you conserve? can't they conserve?
V-ing form
can't I be conserving? can't you be conserving? can't she be conserving? can't we be conserving? can't you be conserving? can't they be conserving?
Perfect
can't I have conserved? can't you have conserved? can't she have conserved? can't we have conserved? can't you have conserved? can't they have conserved?
V-ing perfect
can't I have been conserving? can't you have been conserving? can't she have been conserving? can't we have been conserving? can't you have been conserving? can't they have been conserving?