could pile
Regular verb: pile - piled- piled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could pile
you could pile
he could pile
we could pile
you could pile
they could pile 	I could be piling
you could be piling
he could be piling
we could be piling
you could be piling
they could be piling	I could have piled
you could have piled
he could have piled
we could have piled
you could have piled
they could have piled	I could have been piling
you could have been piling
he could have been piling
we could have been piling
you could have been piling
they could have been piling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't pile
you couldn't pile
he couldn't pile
we couldn't pile
you couldn't pile
they couldn't pile 	I couldn't be piling
you couldn't be piling
he couldn't be piling
we couldn't be piling
you couldn't be piling
they couldn't be piling	I couldn't have piled
you couldn't have piled
he couldn't have piled
we couldn't have piled
you couldn't have piled
they couldn't have piled	I couldn't have been piling
you couldn't have been piling
he couldn't have been piling
we couldn't have been piling
you couldn't have been piling
they couldn't have been piling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I pile?
could you pile?
could he pile?
could we pile?
could you pile?
could they pile? 	could I be piling?
could you be piling?
could he be piling?
could we be piling?
could you be piling?
could they be piling? 	could I have piled?
could you have piled?
could he have piled?
could we have piled?
could you have piled?
could they have piled? 	could I have been piling?
could you have been piling?
could he have been piling?
could we have been piling?
could you have been piling?
could they have been piling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I pile?
couldn't you pile?
couldn't he pile?
couldn't we pile?
couldn't you pile?
couldn't they pile? 	couldn't I be piling?
couldn't you be piling?
couldn't he be piling?
couldn't we be piling?
couldn't you be piling?
couldn't they be piling? 	couldn't I have piled?
couldn't you have piled?
couldn't he have piled?
couldn't we have piled?
couldn't you have piled?
couldn't they have piled? 	couldn't I have been piling?
couldn't you have been piling?
couldn't he have been piling?
couldn't we have been piling?
couldn't you have been piling?
couldn't they have been piling?