can rack
Regular verb: rack - racked- racked

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't rack
you can't rack
she can't rack
we can't rack
you can't rack
they can't rack 	I can't be racking
you can't be racking
she can't be racking
we can't be racking
you can't be racking
they can't be racking	I can't have racked
you can't have racked
she can't have racked
we can't have racked
you can't have racked
they can't have racked	I can't have been racking
you can't have been racking
she can't have been racking
we can't have been racking
you can't have been racking
they can't have been racking	

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

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