can pile
Regular verb: pile - piled- piled

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot pile
you cannot pile
she cannot pile
we cannot pile
you cannot pile
they cannot pile 	I cannot be piling
you cannot be piling
she cannot be piling
we cannot be piling
you cannot be piling
they cannot be piling	I cannot have piled
you cannot have piled
she cannot have piled
we cannot have piled
you cannot have piled
they cannot have piled	I cannot have been piling
you cannot have been piling
she cannot have been piling
we cannot have been piling
you cannot have been piling
they cannot have been piling	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not pile?
can you not pile?
can she not pile?
can we not pile?
can you not pile?
can they not pile? 	can I not be piling?
can you not be piling?
can she not be piling?
can we not be piling?
can you not be piling?
can they not be piling? 	can I not have piled?
can you not have piled?
can she not have piled?
can we not have piled?
can you not have piled?
can they not have piled? 	can I not have been piling?
can you not have been piling?
can she not have been piling?
can we not have been piling?
can you not have been piling?
can they not have been piling?