English verb conjugation
COULD STOCKPILE

Regular verb: stockpile - stockpiled - stockpiled

Affirmation

Simple form	V-ing form
I could stockpile you could stockpile he could stockpile we could stockpile you could stockpile they could stockpile	I could be stockpiling you could be stockpiling he could be stockpiling we could be stockpiling you could be stockpiling they could be stockpiling
Perfect	V-ing perfect
I could have stockpiled you could have stockpiled he could have stockpiled we could have stockpiled you could have stockpiled they could have stockpiled	I could have been stockpiling you could have been stockpiling he could have been stockpiling we could have been stockpiling you could have been stockpiling they could have been stockpiling

Negation

Simple form	V-ing form
I couldn't stockpile you couldn't stockpile he couldn't stockpile we couldn't stockpile you couldn't stockpile they couldn't stockpile	I couldn't be stockpiling you couldn't be stockpiling he couldn't be stockpiling we couldn't be stockpiling you couldn't be stockpiling they couldn't be stockpiling
Perfect	V-ing perfect
I couldn't have stockpiled you couldn't have stockpiled he couldn't have stockpiled we couldn't have stockpiled you couldn't have stockpiled they couldn't have stockpiled	I couldn't have been stockpiling you couldn't have been stockpiling he couldn't have been stockpiling we couldn't have been stockpiling you couldn't have been stockpiling they couldn't have been stockpiling

Interrogative form

Simple form	V-ing form
could I stockpile? could you stockpile? could he stockpile? could we stockpile? could you stockpile? could they stockpile?	could I be stockpiling? could you be stockpiling? could he be stockpiling? could we be stockpiling? could you be stockpiling? could they be stockpiling?
Perfect	V-ing perfect
could I have stockpiled? could you have stockpiled? could he have stockpiled? could we have stockpiled? could you have stockpiled? could they have stockpiled?	could I have been stockpiling? could you have been stockpiling? could he have been stockpiling? could we have been stockpiling? could you have been stockpiling? could they have been stockpiling?

Interro-negative form

Simple form	V-ing form
couldn't I stockpile? couldn't you stockpile? couldn't he stockpile? couldn't we stockpile? couldn't you stockpile? couldn't they stockpile?	couldn't I be stockpiling? couldn't you be stockpiling? couldn't he be stockpiling? couldn't we be stockpiling? couldn't you be stockpiling? couldn't they be stockpiling?
Perfect	V-ing perfect
couldn't I have stockpiled? couldn't you have stockpiled? couldn't he have stockpiled? couldn't we have stockpiled? couldn't you have stockpiled? couldn't they have stockpiled?	couldn't I have been stockpiling? couldn't you have been stockpiling? couldn't he have been stockpiling? couldn't we have been stockpiling? couldn't you have been stockpiling? couldn't they have been stockpiling?