I can indulge you can indulge she can indulge we can indulge you can indulge they can indulge
V-ing form
I can be indulging you can be indulging she can be indulging we can be indulging you can be indulging they can be indulging
Perfect
I can have indulged you can have indulged she can have indulged we can have indulged you can have indulged they can have indulged
V-ing perfect
I can have been indulging you can have been indulging she can have been indulging we can have been indulging you can have been indulging they can have been indulging
Negation
Simple form
I cannot indulge you cannot indulge she cannot indulge we cannot indulge you cannot indulge they cannot indulge
V-ing form
I cannot be indulging you cannot be indulging she cannot be indulging we cannot be indulging you cannot be indulging they cannot be indulging
Perfect
I cannot have indulged you cannot have indulged she cannot have indulged we cannot have indulged you cannot have indulged they cannot have indulged
V-ing perfect
I cannot have been indulging you cannot have been indulging she cannot have been indulging we cannot have been indulging you cannot have been indulging they cannot have been indulging
Interrogative form
Simple form
can I indulge? can you indulge? can she indulge? can we indulge? can you indulge? can they indulge?
V-ing form
can I be indulging? can you be indulging? can she be indulging? can we be indulging? can you be indulging? can they be indulging?
Perfect
can I have indulged? can you have indulged? can she have indulged? can we have indulged? can you have indulged? can they have indulged?
V-ing perfect
can I have been indulging? can you have been indulging? can she have been indulging? can we have been indulging? can you have been indulging? can they have been indulging?
Interro-negative form
Simple form
can I not indulge? can you not indulge? can she not indulge? can we not indulge? can you not indulge? can they not indulge?
V-ing form
can I not be indulging? can you not be indulging? can she not be indulging? can we not be indulging? can you not be indulging? can they not be indulging?
Perfect
can I not have indulged? can you not have indulged? can she not have indulged? can we not have indulged? can you not have indulged? can they not have indulged?
V-ing perfect
can I not have been indulging? can you not have been indulging? can she not have been indulging? can we not have been indulging? can you not have been indulging? can they not have been indulging?