could rack
Regular verb: rack - racked- racked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could rack
you could rack
she could rack
we could rack
you could rack
they could rack 	I could be racking
you could be racking
she could be racking
we could be racking
you could be racking
they could be racking	I could have racked
you could have racked
she could have racked
we could have racked
you could have racked
they could have racked	I could have been racking
you could have been racking
she could have been racking
we could have been racking
you could have been racking
they could have been racking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not rack
you could not rack
she could not rack
we could not rack
you could not rack
they could not rack 	I could not be racking
you could not be racking
she could not be racking
we could not be racking
you could not be racking
they could not be racking	I could not have racked
you could not have racked
she could not have racked
we could not have racked
you could not have racked
they could not have racked	I could not have been racking
you could not have been racking
she could not have been racking
we could not have been racking
you could not have been racking
they could not have been racking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I rack?
could you rack?
could she rack?
could we rack?
could you rack?
could they rack? 	could I be racking?
could you be racking?
could she be racking?
could we be racking?
could you be racking?
could they be racking? 	could I have racked?
could you have racked?
could she have racked?
could we have racked?
could you have racked?
could they have racked? 	could I have been racking?
could you have been racking?
could she have been racking?
could we have been racking?
could you have been racking?
could they have been racking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not rack?
could you not rack?
could she not rack?
could we not rack?
could you not rack?
could they not rack? 	could I not be racking?
could you not be racking?
could she not be racking?
could we not be racking?
could you not be racking?
could they not be racking? 	could I not have racked?
could you not have racked?
could she not have racked?
could we not have racked?
could you not have racked?
could they not have racked? 	could I not have been racking?
could you not have been racking?
could she not have been racking?
could we not have been racking?
could you not have been racking?
could they not have been racking?