can whack
Regular verb: whack - whacked- whacked

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