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