I could cure you could cure he could cure we could cure you could cure they could cure
V-ing form
I could be curing you could be curing he could be curing we could be curing you could be curing they could be curing
Perfect
I could have cured you could have cured he could have cured we could have cured you could have cured they could have cured
V-ing perfect
I could have been curing you could have been curing he could have been curing we could have been curing you could have been curing they could have been curing
Negation
Simple form
I could not cure you could not cure he could not cure we could not cure you could not cure they could not cure
V-ing form
I could not be curing you could not be curing he could not be curing we could not be curing you could not be curing they could not be curing
Perfect
I could not have cured you could not have cured he could not have cured we could not have cured you could not have cured they could not have cured
V-ing perfect
I could not have been curing you could not have been curing he could not have been curing we could not have been curing you could not have been curing they could not have been curing
Interrogative form
Simple form
could I cure? could you cure? could he cure? could we cure? could you cure? could they cure?
V-ing form
could I be curing? could you be curing? could he be curing? could we be curing? could you be curing? could they be curing?
Perfect
could I have cured? could you have cured? could he have cured? could we have cured? could you have cured? could they have cured?
V-ing perfect
could I have been curing? could you have been curing? could he have been curing? could we have been curing? could you have been curing? could they have been curing?
Interro-negative form
Simple form
could I not cure? could you not cure? could he not cure? could we not cure? could you not cure? could they not cure?
V-ing form
could I not be curing? could you not be curing? could he not be curing? could we not be curing? could you not be curing? could they not be curing?
Perfect
could I not have cured? could you not have cured? could he not have cured? could we not have cured? could you not have cured? could they not have cured?
V-ing perfect
could I not have been curing? could you not have been curing? could he not have been curing? could we not have been curing? could you not have been curing? could they not have been curing?