English verb conjugation
CAN HUFF

Regular verb: huff - huffed - huffed

Affirmation

Simple form	V-ing form
I can huff you can huff he can huff we can huff you can huff they can huff	I can be huffing you can be huffing he can be huffing we can be huffing you can be huffing they can be huffing
Perfect	V-ing perfect
I can have huffed you can have huffed he can have huffed we can have huffed you can have huffed they can have huffed	I can have been huffing you can have been huffing he can have been huffing we can have been huffing you can have been huffing they can have been huffing

Negation

Simple form	V-ing form
I can't huff you can't huff he can't huff we can't huff you can't huff they can't huff	I can't be huffing you can't be huffing he can't be huffing we can't be huffing you can't be huffing they can't be huffing
Perfect	V-ing perfect
I can't have huffed you can't have huffed he can't have huffed we can't have huffed you can't have huffed they can't have huffed	I can't have been huffing you can't have been huffing he can't have been huffing we can't have been huffing you can't have been huffing they can't have been huffing

Interrogative form

Simple form	V-ing form
can I huff? can you huff? can he huff? can we huff? can you huff? can they huff?	can I be huffing? can you be huffing? can he be huffing? can we be huffing? can you be huffing? can they be huffing?
Perfect	V-ing perfect
can I have huffed? can you have huffed? can he have huffed? can we have huffed? can you have huffed? can they have huffed?	can I have been huffing? can you have been huffing? can he have been huffing? can we have been huffing? can you have been huffing? can they have been huffing?

Interro-negative form

Simple form	V-ing form
can't I huff? can't you huff? can't he huff? can't we huff? can't you huff? can't they huff?	can't I be huffing? can't you be huffing? can't he be huffing? can't we be huffing? can't you be huffing? can't they be huffing?
Perfect	V-ing perfect
can't I have huffed? can't you have huffed? can't he have huffed? can't we have huffed? can't you have huffed? can't they have huffed?	can't I have been huffing? can't you have been huffing? can't he have been huffing? can't we have been huffing? can't you have been huffing? can't they have been huffing?