English verb conjugation
COULD HUFF

Regular verb: huff - huffed - huffed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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