English verb conjugation
COULD UNPILE

Regular verb: unpile - unpiled - unpiled

Affirmation

Simple form	V-ing form
I could unpile you could unpile he could unpile we could unpile you could unpile they could unpile	I could be unpiling you could be unpiling he could be unpiling we could be unpiling you could be unpiling they could be unpiling
Perfect	V-ing perfect
I could have unpiled you could have unpiled he could have unpiled we could have unpiled you could have unpiled they could have unpiled	I could have been unpiling you could have been unpiling he could have been unpiling we could have been unpiling you could have been unpiling they could have been unpiling

Negation

Simple form	V-ing form
I could not unpile you could not unpile he could not unpile we could not unpile you could not unpile they could not unpile	I could not be unpiling you could not be unpiling he could not be unpiling we could not be unpiling you could not be unpiling they could not be unpiling
Perfect	V-ing perfect
I could not have unpiled you could not have unpiled he could not have unpiled we could not have unpiled you could not have unpiled they could not have unpiled	I could not have been unpiling you could not have been unpiling he could not have been unpiling we could not have been unpiling you could not have been unpiling they could not have been unpiling

Interrogative form

Simple form	V-ing form
could I unpile? could you unpile? could he unpile? could we unpile? could you unpile? could they unpile?	could I be unpiling? could you be unpiling? could he be unpiling? could we be unpiling? could you be unpiling? could they be unpiling?
Perfect	V-ing perfect
could I have unpiled? could you have unpiled? could he have unpiled? could we have unpiled? could you have unpiled? could they have unpiled?	could I have been unpiling? could you have been unpiling? could he have been unpiling? could we have been unpiling? could you have been unpiling? could they have been unpiling?

Interro-negative form

Simple form	V-ing form
could I not unpile? could you not unpile? could he not unpile? could we not unpile? could you not unpile? could they not unpile?	could I not be unpiling? could you not be unpiling? could he not be unpiling? could we not be unpiling? could you not be unpiling? could they not be unpiling?
Perfect	V-ing perfect
could I not have unpiled? could you not have unpiled? could he not have unpiled? could we not have unpiled? could you not have unpiled? could they not have unpiled?	could I not have been unpiling? could you not have been unpiling? could he not have been unpiling? could we not have been unpiling? could you not have been unpiling? could they not have been unpiling?