I can hum you can hum she can hum we can hum you can hum they can hum
V-ing form
I can be huming you can be huming she can be huming we can be huming you can be huming they can be huming
Perfect
I can have humed you can have humed she can have humed we can have humed you can have humed they can have humed
V-ing perfect
I can have been huming you can have been huming she can have been huming we can have been huming you can have been huming they can have been huming
Negation
Simple form
I can't hum you can't hum she can't hum we can't hum you can't hum they can't hum
V-ing form
I can't be huming you can't be huming she can't be huming we can't be huming you can't be huming they can't be huming
Perfect
I can't have humed you can't have humed she can't have humed we can't have humed you can't have humed they can't have humed
V-ing perfect
I can't have been huming you can't have been huming she can't have been huming we can't have been huming you can't have been huming they can't have been huming
Interrogative form
Simple form
can I hum? can you hum? can she hum? can we hum? can you hum? can they hum?
V-ing form
can I be huming? can you be huming? can she be huming? can we be huming? can you be huming? can they be huming?
Perfect
can I have humed? can you have humed? can she have humed? can we have humed? can you have humed? can they have humed?
V-ing perfect
can I have been huming? can you have been huming? can she have been huming? can we have been huming? can you have been huming? can they have been huming?
Interro-negative form
Simple form
can't I hum? can't you hum? can't she hum? can't we hum? can't you hum? can't they hum?
V-ing form
can't I be huming? can't you be huming? can't she be huming? can't we be huming? can't you be huming? can't they be huming?
Perfect
can't I have humed? can't you have humed? can't she have humed? can't we have humed? can't you have humed? can't they have humed?
V-ing perfect
can't I have been huming? can't you have been huming? can't she have been huming? can't we have been huming? can't you have been huming? can't they have been huming?