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