English verb conjugation
COULD WHIFF

Regular verb: whiff - whiffed - whiffed

Affirmation

Simple form	V-ing form
I could whiff you could whiff she could whiff we could whiff you could whiff they could whiff	I could be whiffing you could be whiffing she could be whiffing we could be whiffing you could be whiffing they could be whiffing
Perfect	V-ing perfect
I could have whiffed you could have whiffed she could have whiffed we could have whiffed you could have whiffed they could have whiffed	I could have been whiffing you could have been whiffing she could have been whiffing we could have been whiffing you could have been whiffing they could have been whiffing

Negation

Simple form	V-ing form
I could not whiff you could not whiff she could not whiff we could not whiff you could not whiff they could not whiff	I could not be whiffing you could not be whiffing she could not be whiffing we could not be whiffing you could not be whiffing they could not be whiffing
Perfect	V-ing perfect
I could not have whiffed you could not have whiffed she could not have whiffed we could not have whiffed you could not have whiffed they could not have whiffed	I could not have been whiffing you could not have been whiffing she could not have been whiffing we could not have been whiffing you could not have been whiffing they could not have been whiffing

Interrogative form

Simple form	V-ing form
could I whiff? could you whiff? could she whiff? could we whiff? could you whiff? could they whiff?	could I be whiffing? could you be whiffing? could she be whiffing? could we be whiffing? could you be whiffing? could they be whiffing?
Perfect	V-ing perfect
could I have whiffed? could you have whiffed? could she have whiffed? could we have whiffed? could you have whiffed? could they have whiffed?	could I have been whiffing? could you have been whiffing? could she have been whiffing? could we have been whiffing? could you have been whiffing? could they have been whiffing?

Interro-negative form

Simple form	V-ing form
could I not whiff? could you not whiff? could she not whiff? could we not whiff? could you not whiff? could they not whiff?	could I not be whiffing? could you not be whiffing? could she not be whiffing? could we not be whiffing? could you not be whiffing? could they not be whiffing?
Perfect	V-ing perfect
could I not have whiffed? could you not have whiffed? could she not have whiffed? could we not have whiffed? could you not have whiffed? could they not have whiffed?	could I not have been whiffing? could you not have been whiffing? could she not have been whiffing? could we not have been whiffing? could you not have been whiffing? could they not have been whiffing?