I can pile you can pile she can pile we can pile you can pile they can pile
V-ing form
I can be piling you can be piling she can be piling we can be piling you can be piling they can be piling
Perfect
I can have piled you can have piled she can have piled we can have piled you can have piled they can have piled
V-ing perfect
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
I can't pile you can't pile she can't pile we can't pile you can't pile they can't pile
V-ing form
I can't be piling you can't be piling she can't be piling we can't be piling you can't be piling they can't be piling
Perfect
I can't have piled you can't have piled she can't have piled we can't have piled you can't have piled they can't have piled
V-ing perfect
I can't have been piling you can't have been piling she can't have been piling we can't have been piling you can't have been piling they can't have been piling
Interrogative form
Simple form
can I pile? can you pile? can she pile? can we pile? can you pile? can they pile?
V-ing form
can I be piling? can you be piling? can she be piling? can we be piling? can you be piling? can they be piling?
Perfect
can I have piled? can you have piled? can she have piled? can we have piled? can you have piled? can they have piled?
V-ing perfect
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
can't I pile? can't you pile? can't she pile? can't we pile? can't you pile? can't they pile?
V-ing form
can't I be piling? can't you be piling? can't she be piling? can't we be piling? can't you be piling? can't they be piling?
Perfect
can't I have piled? can't you have piled? can't she have piled? can't we have piled? can't you have piled? can't they have piled?
V-ing perfect
can't I have been piling? can't you have been piling? can't she have been piling? can't we have been piling? can't you have been piling? can't they have been piling?