could rack
Verbo regular: rack - racked- racked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could rack
you could rack
he could rack
we could rack
you could rack
they could rack 	I could be racking
you could be racking
he could be racking
we could be racking
you could be racking
they could be racking	I could have racked
you could have racked
he 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
he could have been racking
we could have been racking
you could have been racking
they could have been racking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't rack
you couldn't rack
he 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
he 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
he 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
he couldn't have been racking
we couldn't have been racking
you couldn't have been racking
they couldn't have been racking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I rack?
could you rack?
could he rack?
could we rack?
could you rack?
could they rack? 	could I be racking?
could you be racking?
could he be racking?
could we be racking?
could you be racking?
could they be racking? 	could I have racked?
could you have racked?
could he 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 he have been racking?
could we have been racking?
could you have been racking?
could they have been racking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I rack?
couldn't you rack?
couldn't he 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 he 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 he 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 he have been racking?
couldn't we have been racking?
couldn't you have been racking?
couldn't they have been racking?