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 couldn't rack
you couldn't rack
she couldn't rack
we couldn't rack
you couldn't rack
they couldn't rack 	I couldn't be racking
you couldn't be racking
she couldn't be racking
we couldn't be racking
you couldn't be racking
they couldn't be racking	I couldn't have racked
you couldn't have racked
she couldn't have racked
we couldn't have racked
you couldn't have racked
they couldn't have racked	I couldn't have been racking
you couldn't have been racking
she couldn't have been racking
we couldn't have been racking
you couldn't have been racking
they couldn't 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 	
couldn't I rack?
couldn't you rack?
couldn't she rack?
couldn't we rack?
couldn't you rack?
couldn't they rack? 	couldn't I be racking?
couldn't you be racking?
couldn't she be racking?
couldn't we be racking?
couldn't you be racking?
couldn't they be racking? 	couldn't I have racked?
couldn't you have racked?
couldn't she have racked?
couldn't we have racked?
couldn't you have racked?
couldn't they have racked? 	couldn't I have been racking?
couldn't you have been racking?
couldn't she have been racking?
couldn't we have been racking?
couldn't you have been racking?
couldn't they have been racking?