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 couldn't unpile you couldn't unpile he couldn't unpile we couldn't unpile you couldn't unpile they couldn't unpile	I couldn't be unpiling you couldn't be unpiling he couldn't be unpiling we couldn't be unpiling you couldn't be unpiling they couldn't be unpiling
Perfect	V-ing perfect
I couldn't have unpiled you couldn't have unpiled he couldn't have unpiled we couldn't have unpiled you couldn't have unpiled they couldn't have unpiled	I couldn't have been unpiling you couldn't have been unpiling he couldn't have been unpiling we couldn't have been unpiling you couldn't have been unpiling they couldn't 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
couldn't I unpile? couldn't you unpile? couldn't he unpile? couldn't we unpile? couldn't you unpile? couldn't they unpile?	couldn't I be unpiling? couldn't you be unpiling? couldn't he be unpiling? couldn't we be unpiling? couldn't you be unpiling? couldn't they be unpiling?
Perfect	V-ing perfect
couldn't I have unpiled? couldn't you have unpiled? couldn't he have unpiled? couldn't we have unpiled? couldn't you have unpiled? couldn't they have unpiled?	couldn't I have been unpiling? couldn't you have been unpiling? couldn't he have been unpiling? couldn't we have been unpiling? couldn't you have been unpiling? couldn't they have been unpiling?