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 cannot whiff you cannot whiff he cannot whiff we cannot whiff you cannot whiff they cannot whiff	I cannot be whiffing you cannot be whiffing he cannot be whiffing we cannot be whiffing you cannot be whiffing they cannot be whiffing
Perfect	V-ing perfect
I cannot have whiffed you cannot have whiffed he cannot have whiffed we cannot have whiffed you cannot have whiffed they cannot have whiffed	I cannot have been whiffing you cannot have been whiffing he cannot have been whiffing we cannot have been whiffing you cannot have been whiffing they cannot 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 I not whiff? can you not whiff? can he not whiff? can we not whiff? can you not whiff? can they not whiff?	can I not be whiffing? can you not be whiffing? can he not be whiffing? can we not be whiffing? can you not be whiffing? can they not be whiffing?
Perfect	V-ing perfect
can I not have whiffed? can you not have whiffed? can he not have whiffed? can we not have whiffed? can you not have whiffed? can they not have whiffed?	can I not have been whiffing? can you not have been whiffing? can he not have been whiffing? can we not have been whiffing? can you not have been whiffing? can they not have been whiffing?