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 cannot huff you cannot huff he cannot huff we cannot huff you cannot huff they cannot huff	I cannot be huffing you cannot be huffing he cannot be huffing we cannot be huffing you cannot be huffing they cannot be huffing
Perfect	V-ing perfect
I cannot have huffed you cannot have huffed he cannot have huffed we cannot have huffed you cannot have huffed they cannot have huffed	I cannot have been huffing you cannot have been huffing he cannot have been huffing we cannot have been huffing you cannot have been huffing they cannot 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 I not huff? can you not huff? can he not huff? can we not huff? can you not huff? can they not huff?	can I not be huffing? can you not be huffing? can he not be huffing? can we not be huffing? can you not be huffing? can they not be huffing?
Perfect	V-ing perfect
can I not have huffed? can you not have huffed? can he not have huffed? can we not have huffed? can you not have huffed? can they not have huffed?	can I not have been huffing? can you not have been huffing? can he not have been huffing? can we not have been huffing? can you not have been huffing? can they not have been huffing?