could whack
Regular verb: whack - whacked- whacked

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

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