English verb conjugation
CAN WHIFF

Regular verb: whiff - whiffed - whiffed

Affirmation

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

Negation

Simple form	V-ing form
I can't whiff you can't whiff he can't whiff we can't whiff you can't whiff they can't whiff	I can't be whiffing you can't be whiffing he can't be whiffing we can't be whiffing you can't be whiffing they can't be whiffing
Perfect	V-ing perfect
I can't have whiffed you can't have whiffed he can't have whiffed we can't have whiffed you can't have whiffed they can't have whiffed	I can't have been whiffing you can't have been whiffing he can't have been whiffing we can't have been whiffing you can't have been whiffing they can't have been whiffing

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can't I whiff? can't you whiff? can't he whiff? can't we whiff? can't you whiff? can't they whiff?	can't I be whiffing? can't you be whiffing? can't he be whiffing? can't we be whiffing? can't you be whiffing? can't they be whiffing?
Perfect	V-ing perfect
can't I have whiffed? can't you have whiffed? can't he have whiffed? can't we have whiffed? can't you have whiffed? can't they have whiffed?	can't I have been whiffing? can't you have been whiffing? can't he have been whiffing? can't we have been whiffing? can't you have been whiffing? can't they have been whiffing?