could whack
Regular verb: whack - whacked- whacked

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

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

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

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