English verb conjugation COULD STACK

Regular verb: stack - stacked - stacked

Affirmation

Simple form

I could stack
you could stack
he could stack
we could stack
you could stack
they could stack

V-ing form

I could be stacking
you could be stacking
he could be stacking
we could be stacking
you could be stacking
they could be stacking

Perfect

I could have stacked
you could have stacked
he could have stacked
we could have stacked
you could have stacked
they could have stacked

V-ing perfect

I could have been stacking
you could have been stacking
he could have been stacking
we could have been stacking
you could have been stacking
they could have been stacking

Negation

Simple form

I couldn't stack
you couldn't stack
he couldn't stack
we couldn't stack
you couldn't stack
they couldn't stack

V-ing form

I couldn't be stacking
you couldn't be stacking
he couldn't be stacking
we couldn't be stacking
you couldn't be stacking
they couldn't be stacking

Perfect

I couldn't have stacked
you couldn't have stacked
he couldn't have stacked
we couldn't have stacked
you couldn't have stacked
they couldn't have stacked

V-ing perfect

I couldn't have been stacking
you couldn't have been stacking
he couldn't have been stacking
we couldn't have been stacking
you couldn't have been stacking
they couldn't have been stacking

Interrogative form

Simple form

could I stack?
could you stack?
could he stack?
could we stack?
could you stack?
could they stack?

V-ing form

could I be stacking?
could you be stacking?
could he be stacking?
could we be stacking?
could you be stacking?
could they be stacking?

Perfect

could I have stacked?
could you have stacked?
could he have stacked?
could we have stacked?
could you have stacked?
could they have stacked?

V-ing perfect

could I have been stacking?
could you have been stacking?
could he have been stacking?
could we have been stacking?
could you have been stacking?
could they have been stacking?

Interro-negative form

Simple form

couldn't I stack?
couldn't you stack?
couldn't he stack?
couldn't we stack?
couldn't you stack?
couldn't they stack?

V-ing form

couldn't I be stacking?
couldn't you be stacking?
couldn't he be stacking?
couldn't we be stacking?
couldn't you be stacking?
couldn't they be stacking?

Perfect

couldn't I have stacked?
couldn't you have stacked?
couldn't he have stacked?
couldn't we have stacked?
couldn't you have stacked?
couldn't they have stacked?

V-ing perfect

couldn't I have been stacking?
couldn't you have been stacking?
couldn't he have been stacking?
couldn't we have been stacking?
couldn't you have been stacking?
couldn't they have been stacking?

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