English verb conjugation
CAN WHACK

Regular verb: whack - whacked - whacked

Affirmation

Simple form	V-ing form
I can whack you can whack he can whack we can whack you can whack they can whack	I can be whacking you can be whacking he can be whacking we can be whacking you can be whacking they can be whacking
Perfect	V-ing perfect
I can have whacked you can have whacked he can have whacked we can have whacked you can have whacked they can have whacked	I can have been whacking you can have been whacking he can have been whacking we can have been whacking you can have been whacking they can have been whacking

Negation

Simple form	V-ing form
I can't whack you can't whack he can't whack we can't whack you can't whack they can't whack	I can't be whacking you can't be whacking he can't be whacking we can't be whacking you can't be whacking they can't be whacking
Perfect	V-ing perfect
I can't have whacked you can't have whacked he can't have whacked we can't have whacked you can't have whacked they can't have whacked	I can't have been whacking you can't have been whacking he can't have been whacking we can't have been whacking you can't have been whacking they can't have been whacking

Interrogative form

Simple form	V-ing form
can I whack? can you whack? can he whack? can we whack? can you whack? can they whack?	can I be whacking? can you be whacking? can he be whacking? can we be whacking? can you be whacking? can they be whacking?
Perfect	V-ing perfect
can I have whacked? can you have whacked? can he have whacked? can we have whacked? can you have whacked? can they have whacked?	can I have been whacking? can you have been whacking? can he have been whacking? can we have been whacking? can you have been whacking? can they have been whacking?

Interro-negative form

Simple form	V-ing form
can't I whack? can't you whack? can't he whack? can't we whack? can't you whack? can't they whack?	can't I be whacking? can't you be whacking? can't he be whacking? can't we be whacking? can't you be whacking? can't they be whacking?
Perfect	V-ing perfect
can't I have whacked? can't you have whacked? can't he have whacked? can't we have whacked? can't you have whacked? can't they have whacked?	can't I have been whacking? can't you have been whacking? can't he have been whacking? can't we have been whacking? can't you have been whacking? can't they have been whacking?