English verb conjugation
CAN WHACK

Regular verb: whack - whacked - whacked

Affirmation

Simple form	V-ing form
I can whack you can whack she can whack we can whack you can whack they can whack	I can be whacking you can be whacking she 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 she 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 she 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 cannot whack you cannot whack she cannot whack we cannot whack you cannot whack they cannot whack	I cannot be whacking you cannot be whacking she cannot be whacking we cannot be whacking you cannot be whacking they cannot be whacking
Perfect	V-ing perfect
I cannot have whacked you cannot have whacked she cannot have whacked we cannot have whacked you cannot have whacked they cannot have whacked	I cannot have been whacking you cannot have been whacking she cannot have been whacking we cannot have been whacking you cannot have been whacking they cannot have been whacking

Interrogative form

Simple form	V-ing form
can I whack? can you whack? can she whack? can we whack? can you whack? can they whack?	can I be whacking? can you be whacking? can she 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 she 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 she 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 I not whack? can you not whack? can she not whack? can we not whack? can you not whack? can they not whack?	can I not be whacking? can you not be whacking? can she not be whacking? can we not be whacking? can you not be whacking? can they not be whacking?
Perfect	V-ing perfect
can I not have whacked? can you not have whacked? can she not have whacked? can we not have whacked? can you not have whacked? can they not have whacked?	can I not have been whacking? can you not have been whacking? can she not have been whacking? can we not have been whacking? can you not have been whacking? can they not have been whacking?